Web-based Education to Enhance Fibromyalgia Management

NCT ID: NCT00423631

Last Updated: 2011-10-10

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

Get a concise snapshot of the trial, including recruitment status, study phase, enrollment targets, and key timeline milestones.

Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

118 participants

Study Classification

INTERVENTIONAL

Study Start Date

2006-09-30

Study Completion Date

2008-04-30

Brief Summary

Review the sponsor-provided synopsis that highlights what the study is about and why it is being conducted.

Fibromyalgia (FMS) a condition marked by pain, fatigue, and memory complaints, is considered a chronic condition and is most commonly treated or managed using medications. Previous studies have found benefit in adding cognitive-behavioral therapy (CBT), a non-medication intervention, to standard care in order to obtain better outcomes in terms of improved functional status and symptom reduction. While the addition of CBT to standard care has been shown to be beneficial, it is not a form of therapy that is widely available to patients with FMS. CBT includes a variety of skills that can be taught to patients to help in the management of chronic illnesses. This protocol will examine the relative merits of providing these CBT skills to patients via an informational website. The website will contain the content of CBT, a social support capability, and data transfer capabilities. The addition of this website to standard care will be compared to standard care alone. This study is interested in assessing improvements in physical functional status, the symptoms of FMS, and the relative costs of the interventions as compared to the savings in health care utilization over a 6-month period.

Primary Hypothesis The primary hypothesis of this study is that the number of patients with fibromyalgia who are able to achieve clinically meaningful improvements in physical function will be greater when standard symptom-based pharmacological care is augmented by CBT skills delivered through an educational website.

Secondary Hypotheses

1. The proportion of patients with fibromyalgia who are able to achieve clinically meaningful improvements in symptoms of FMS such as pain, fatigue, and perceived cognitive difficulties will be greater when standard symptom-based pharmacological care is augmented by CBT skills delivered through an educational website
2. The proportion of patients with fibromyalgia who are able to achieve clinically meaningful improvements in mood and beliefs about pain will be greater when standard symptom-based pharmacological care is augmented by CBT skills delivered through an educational website

Detailed Description

Dive into the extended narrative that explains the scientific background, objectives, and procedures in greater depth.

Cognitive-Behavioral Therapy is a therapeutic approach that uses specific techniques to produce behavioral and cognitive change. CBT is not a singular approach to all problems; rather it is a set of techniques that can be tailored for specific problems. The techniques falling under the rubric of CBT have in common a scientific foundation based in learning and cognitive principles. The techniques used to change behavior are based on principles of classical and operant conditioning (e.g. extinction, positive and negative reinforcement, shaping, prompts), and observational learning. The techniques used to produce cognitive change are based largely on the development of problem solving skills and principles of attributional change (Craighead, Craighead, Kazdin, \& Mahoney, 1994).

Cognitive behavioral therapy has been shown to be effective in the management of symptoms for a wide range of chronic medical illnesses (Compas, Haaga, Keefe, Leitenberg, \& Williams, 1998; Emmelkamp \& van Oppen, 1993; Gil et al., 1996)(1994; Emmelkamp et al., 1993; Turner \& Romano, 1990; Gil et al., 1996; Keefe, 1996) including Fibromyalgia (Bradley, 1989; Nielson, Walker, \& McCain, 1992; White \& Nielson, 1995; Goldenberg, Kaplan, \& Nadeau, 1994; Nielson et al., 1992; White et al., 1995; Goldenberg et al., 1994) and related conditions such as chronic fatigue syndrome (Sharpe et al., 1996; Deale, Chalder, Marks, \& Wessely, 1997; Deale, Chalder, Marks, \& Wessely, 1997). The rationale for using CBT with FMS stems from the assumption that pain and suffering is the result of a complex integration of pathophysiology, cognition, affect, and behavior (Keefe, 1996). Modification of any one of these four factors can positively or negatively impact the course of the persistent medical condition.

When applied to patients having fibromyalgia, CBT has been shown to be associated with both short-term (3 weeks) and long-term (30 months) improvements in pain, distress, and perceived control over pain (Nielson et al., 1992; White et al., 1995; White et al., 1995). Several other investigations of CBT have demonstrated improvements in depression, pain behaviors, and tenderness (Nicassio et al., 1997), as well as knowledge of fibromyalgia and coping with pain (Vlaeyen et al., 1996). While the latter two studies did not demonstrate a superiority of CBT over educational approaches, a meta-analytic review concluded that psychological interventions for fibromyalgia in general produced effect sizes that exceeded those of physical therapy or pharmacological interventions for outcomes such as symptoms, mental health, and physical functioning (Rossy et al., 1999). The latter outcome, a sustained improvement in physical functioning, was the most difficult outcome to achieve for patients with fibromyalgia using any form of intervention. One recent study however demonstrated that 1-year sustained improvements in physical functional status were three times more likely in patients that attended a brief course of CBT than if they received only symptom-based pharmacological care (Williams, 2002).

New Advances in CBT Delivery Despite the demonstrated effectiveness of combining pharmacological interventions with CBT, integration of CBT into mainstream clinical practice for FMS has been slow. Barriers have not been due to lack of demonstrated efficacy, but rather to economic and administrative issues such as the lack of CPT codes for applying a psychological intervention for a physical illness, difficulties administering a time-intensive psychological intervention to populations that must travel long distances each week to obtain the intervention, and the lack of sufficient numbers of trained professionals to deliver the intervention on a large scale (Muehrer, 2000).

A current technology, Internet websites, has been implemented in an effort to overcome some of the barriers that have prevented the delivery of clinical services to FMS populations.

Healthcare Websites E-learning, the use of a website for education without the use of a live instructor, has become a popular method for educating the lay-public, for offering classes for credit and for continuing education online, and for training employees new job skills. Numerous websites exist that purport to improve health. Some of these sites simply provide information about illness, others provide interactive preprogrammed advice, and some send tailored health messages to patients.

The current study will seek to evaluate the effectiveness of using traditional standard care with standard care plus Internet web-based educational programming. This will be one of the largest randomized controlled trials to use web-based learning and should help to identify the feasibility of using this modality to augment standard care for the FMS community.

Conditions

See the medical conditions and disease areas that this research is targeting or investigating.

Fibromyalgia Fibrositis

Study Design

Understand how the trial is structured, including allocation methods, masking strategies, primary purpose, and other design elements.

Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

Review each arm or cohort in the study, along with the interventions and objectives associated with them.

Standard Care and Web

Standard care plus a web site based on cognitive behavioral principals.

Group Type EXPERIMENTAL

Standard care and web

Intervention Type BEHAVIORAL

A static web site containing cognitive and behavioral self management instructions.

Standard Care

Subject recieve standard care from their primary care provider.

Group Type ACTIVE_COMPARATOR

Standard Care

Intervention Type BEHAVIORAL

Standard care delivered by the primary care provider.

Interventions

Learn about the drugs, procedures, or behavioral strategies being tested and how they are applied within this trial.

Standard care and web

A static web site containing cognitive and behavioral self management instructions.

Intervention Type BEHAVIORAL

Standard Care

Standard care delivered by the primary care provider.

Intervention Type BEHAVIORAL

Eligibility Criteria

Check the participation requirements, including inclusion and exclusion rules, age limits, and whether healthy volunteers are accepted.

Inclusion Criteria

1. Ability to travel to Sioux Falls, SD for study visits.
2. All subjects must fulfill the diagnostic criteria for fibromyalgia as established by the American College of Rheumatology (ACR) in 1990 (Wolfe et al., 1990)
3. Be 18 years of age
4. All subjects must have been in standard medical care with a physician for at least 3 months.
5. Subjects must have a home computer or access to a computer with the following features:

* An Internet browser that is Internet Explorer version 5.0 or higher.
* Printer
* Speakers or headphones
* Ability to use e-mail and access to the Internet
6. Subjects must be able to perform the following screening test designed to assess computer ability:

* Go to a webpage Log in to a website
* Click on an icon
* Click on a radio button to answer a multiple choice question
* Fill a name into a text box
* Click on a submit button
* Print a document

Exclusion Criteria

Subjects will be excluded from participation if they have any of the following:

1. A severe physical impairment that precludes receiving/using the website or using the CBT skills contained on the website (e.g. complete blindness)
2. Co-morbid medical illnesses capable of causing a worsening of physical functional status independent of fibromyalgia (e.g. morbid obesity, autoimmune diseases,) cardiopulmonary disorders (e.g. angina, congestive heart failure, COPD, chronic asthma), uncontrolled endocrine or allergic disorders (e.g. thyroid dysfunction, Type I diabetes), and malignancy within 2 years.
3. Any present psychiatric disorder involving a history of psychosis (e.g. schizophrenia, schizoaffective disorder, schizophreniform disorder, delusional disorder etc.), current suicide risk or attempt within 2 years of the study, or substance abuse within 2 years. Note: Subjects with mood disorders will not be excluded.
4. Prior face to face CBT for pain management.
5. Receiving or applying for or considering seeking disability payments.
Minimum Eligible Age

18 Years

Maximum Eligible Age

70 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

Meet the organizations funding or collaborating on the study and learn about their roles.

University of Michigan

OTHER

Sponsor Role lead

Responsible Party

Identify the individual or organization who holds primary responsibility for the study information submitted to regulators.

David A. Williams

Professor

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

Learn about the lead researchers overseeing the trial and their institutional affiliations.

David A Williams, PhD

Role: PRINCIPAL_INVESTIGATOR

University of Michigan

Locations

Explore where the study is taking place and check the recruitment status at each participating site.

Avera Research Institute

Sioux Falls, South Dakota, United States

Site Status

Countries

Review the countries where the study has at least one active or historical site.

United States

References

Explore related publications, articles, or registry entries linked to this study.

Fukuda K, Nisenbaum R, Stewart G, Thompson WW, Robin L, Washko RM, Noah DL, Barrett DH, Randall B, Herwaldt BL, Mawle AC, Reeves WC. Chronic multisymptom illness affecting Air Force veterans of the Gulf War. JAMA. 1998 Sep 16;280(11):981-8. doi: 10.1001/jama.280.11.981.

Reference Type BACKGROUND
PMID: 9749480 (View on PubMed)

Clauw DJ, Chrousos GP. Chronic pain and fatigue syndromes: overlapping clinical and neuroendocrine features and potential pathogenic mechanisms. Neuroimmunomodulation. 1997 May-Jun;4(3):134-53. doi: 10.1159/000097332.

Reference Type BACKGROUND
PMID: 9500148 (View on PubMed)

Clauw DJ. Fibromyalgia: more than just a musculoskeletal disease. Am Fam Physician. 1995 Sep 1;52(3):843-51, 853-4.

Reference Type BACKGROUND
PMID: 7653424 (View on PubMed)

Crofford LJ, Engleberg NC, Demitrack MA. Neurohormonal perturbations in fibromyalgia. Baillieres Clin Rheumatol. 1996 May;10(2):365-78. doi: 10.1016/s0950-3579(96)80022-7.

Reference Type BACKGROUND
PMID: 8911654 (View on PubMed)

Wolfe F, Ross K, Anderson J, Russell IJ, Hebert L. The prevalence and characteristics of fibromyalgia in the general population. Arthritis Rheum. 1995 Jan;38(1):19-28. doi: 10.1002/art.1780380104.

Reference Type BACKGROUND
PMID: 7818567 (View on PubMed)

Wolfe F, Smythe HA, Yunus MB, Bennett RM, Bombardier C, Goldenberg DL, Tugwell P, Campbell SM, Abeles M, Clark P, et al. The American College of Rheumatology 1990 Criteria for the Classification of Fibromyalgia. Report of the Multicenter Criteria Committee. Arthritis Rheum. 1990 Feb;33(2):160-72. doi: 10.1002/art.1780330203.

Reference Type BACKGROUND
PMID: 2306288 (View on PubMed)

Yunus MB. Towards a model of pathophysiology of fibromyalgia: aberrant central pain mechanisms with peripheral modulation. J Rheumatol. 1992 Jun;19(6):846-50. No abstract available.

Reference Type BACKGROUND
PMID: 1404119 (View on PubMed)

Carette S, Bell MJ, Reynolds WJ, Haraoui B, McCain GA, Bykerk VP, Edworthy SM, Baron M, Koehler BE, Fam AG, et al. Comparison of amitriptyline, cyclobenzaprine, and placebo in the treatment of fibromyalgia. A randomized, double-blind clinical trial. Arthritis Rheum. 1994 Jan;37(1):32-40. doi: 10.1002/art.1780370106.

Reference Type BACKGROUND
PMID: 8129762 (View on PubMed)

Godfrey RG. A guide to the understanding and use of tricyclic antidepressants in the overall management of fibromyalgia and other chronic pain syndromes. Arch Intern Med. 1996 May 27;156(10):1047-52.

Reference Type BACKGROUND
PMID: 8638990 (View on PubMed)

Compas BE, Haaga DA, Keefe FJ, Leitenberg H, Williams DA. Sampling of empirically supported psychological treatments from health psychology: smoking, chronic pain, cancer, and bulimia nervosa. J Consult Clin Psychol. 1998 Feb;66(1):89-112. doi: 10.1037//0022-006x.66.1.89.

Reference Type BACKGROUND
PMID: 9489263 (View on PubMed)

Emmelkamp PM, van Oppen P. Cognitive interventions in behavioral medicine. Psychother Psychosom. 1993;59(3-4):116-30. doi: 10.1159/000288656.

Reference Type BACKGROUND
PMID: 8416088 (View on PubMed)

Gil KM, Wilson JJ, Edens JL, Webster DA, Abrams MA, Orringer E, Grant M, Clark WC, Janal MN. Effects of cognitive coping skills training on coping strategies and experimental pain sensitivity in African American adults with sickle cell disease. Health Psychol. 1996 Jan;15(1):3-10. doi: 10.1037//0278-6133.15.1.3.

Reference Type BACKGROUND
PMID: 8788535 (View on PubMed)

The Persian Gulf experience and health. NIH Technology Assessment Workshop Panel. JAMA. 1994 Aug 3;272(5):391-6. No abstract available.

Reference Type BACKGROUND
PMID: 8028172 (View on PubMed)

Bradley LA. Cognitive-behavioral therapy for primary fibromyalgia. J Rheumatol Suppl. 1989 Nov;19:131-6.

Reference Type BACKGROUND
PMID: 2691672 (View on PubMed)

White KP, Nielson WR. Cognitive behavioral treatment of fibromyalgia syndrome: a followup assessment. J Rheumatol. 1995 Apr;22(4):717-21.

Reference Type BACKGROUND
PMID: 7791170 (View on PubMed)

Sharpe M, Hawton K, Simkin S, Surawy C, Hackmann A, Klimes I, Peto T, Warrell D, Seagroatt V. Cognitive behaviour therapy for the chronic fatigue syndrome: a randomized controlled trial. BMJ. 1996 Jan 6;312(7022):22-6. doi: 10.1136/bmj.312.7022.22.

Reference Type BACKGROUND
PMID: 8555852 (View on PubMed)

Deale A, Chalder T, Marks I, Wessely S. Cognitive behavior therapy for chronic fatigue syndrome: a randomized controlled trial. Am J Psychiatry. 1997 Mar;154(3):408-14. doi: 10.1176/ajp.154.3.408.

Reference Type BACKGROUND
PMID: 9054791 (View on PubMed)

Nicassio PM, Radojevic V, Weisman MH, Schuman C, Kim J, Schoenfeld-Smith K, Krall T. A comparison of behavioral and educational interventions for fibromyalgia. J Rheumatol. 1997 Oct;24(10):2000-7.

Reference Type BACKGROUND
PMID: 9330945 (View on PubMed)

Vlaeyen JW, Teeken-Gruben NJ, Goossens ME, Rutten-van Molken MP, Pelt RA, van Eek H, Heuts PH. Cognitive-educational treatment of fibromyalgia: a randomized clinical trial. I. Clinical effects. J Rheumatol. 1996 Jul;23(7):1237-45.

Reference Type BACKGROUND
PMID: 8823699 (View on PubMed)

Rossy LA, Buckelew SP, Dorr N, Hagglund KJ, Thayer JF, McIntosh MJ, Hewett JE, Johnson JC. A meta-analysis of fibromyalgia treatment interventions. Ann Behav Med. 1999 Spring;21(2):180-91. doi: 10.1007/BF02908299.

Reference Type BACKGROUND
PMID: 10499139 (View on PubMed)

Williams DA, Cary MA, Groner KH, Chaplin W, Glazer LJ, Rodriguez AM, Clauw DJ. Improving physical functional status in patients with fibromyalgia: a brief cognitive behavioral intervention. J Rheumatol. 2002 Jun;29(6):1280-6.

Reference Type BACKGROUND
PMID: 12064847 (View on PubMed)

Muehrer P. Research on adherence, behavior change, and mental health: a workshop overview. Health Psychol. 2000 May;19(3):304-7. doi: 10.1037//0278-6133.19.3.304.

Reference Type BACKGROUND
PMID: 10868776 (View on PubMed)

Horowitz LM, Rosenberg SE, Baer BA, Ureno G, Villasenor VS. Inventory of interpersonal problems: psychometric properties and clinical applications. J Consult Clin Psychol. 1988 Dec;56(6):885-92. doi: 10.1037//0022-006x.56.6.885. No abstract available.

Reference Type BACKGROUND
PMID: 3204198 (View on PubMed)

Ware JE Jr, Bayliss MS, Rogers WH, Kosinski M, Tarlov AR. Differences in 4-year health outcomes for elderly and poor, chronically ill patients treated in HMO and fee-for-service systems. Results from the Medical Outcomes Study. JAMA. 1996 Oct 2;276(13):1039-47.

Reference Type BACKGROUND
PMID: 8847764 (View on PubMed)

Jacobson NS, Truax P. Clinical significance: a statistical approach to defining meaningful change in psychotherapy research. J Consult Clin Psychol. 1991 Feb;59(1):12-9. doi: 10.1037//0022-006x.59.1.12.

Reference Type BACKGROUND
PMID: 2002127 (View on PubMed)

Melzack R. The short-form McGill Pain Questionnaire. Pain. 1987 Aug;30(2):191-197. doi: 10.1016/0304-3959(87)91074-8.

Reference Type BACKGROUND
PMID: 3670870 (View on PubMed)

Smets EM, Garssen B, Bonke B, De Haes JC. The Multidimensional Fatigue Inventory (MFI) psychometric qualities of an instrument to assess fatigue. J Psychosom Res. 1995 Apr;39(3):315-25. doi: 10.1016/0022-3999(94)00125-o.

Reference Type BACKGROUND
PMID: 7636775 (View on PubMed)

Schluederberg A, Straus SE, Peterson P, Blumenthal S, Komaroff AL, Spring SB, Landay A, Buchwald D. NIH conference. Chronic fatigue syndrome research. Definition and medical outcome assessment. Ann Intern Med. 1992 Aug 15;117(4):325-31. doi: 10.7326/0003-4819-117-4-325.

Reference Type BACKGROUND
PMID: 1322076 (View on PubMed)

Geisser ME, Robinson ME, Keefe FJ, Weiner ML. Catastrophizing, depression and the sensory, affective and evaluative aspects of chronic pain. Pain. 1994 Oct;59(1):79-83. doi: 10.1016/0304-3959(94)90050-7.

Reference Type BACKGROUND
PMID: 7854806 (View on PubMed)

Sullivan MJ, D'Eon JL. Relation between catastrophizing and depression in chronic pain patients. J Abnorm Psychol. 1990 Aug;99(3):260-3. doi: 10.1037//0021-843x.99.3.260.

Reference Type BACKGROUND
PMID: 2145334 (View on PubMed)

Keefe FJ, Brown GK, Wallston KA, Caldwell DS. Coping with rheumatoid arthritis pain: catastrophizing as a maladaptive strategy. Pain. 1989 Apr;37(1):51-56. doi: 10.1016/0304-3959(89)90152-8.

Reference Type BACKGROUND
PMID: 2726278 (View on PubMed)

Jensen MP, Turner JA, Romano JM, Karoly P. Coping with chronic pain: a critical review of the literature. Pain. 1991 Dec;47(3):249-283. doi: 10.1016/0304-3959(91)90216-K.

Reference Type BACKGROUND
PMID: 1784498 (View on PubMed)

Lacker JM, Carosella AM, Feuerstein M. Pain expectancies, pain, and functional self-efficacy expectancies as determinants of disability in patients with chronic low back disorders. J Consult Clin Psychol. 1996 Feb;64(1):212-20. doi: 10.1037//0022-006x.64.1.212.

Reference Type BACKGROUND
PMID: 8907101 (View on PubMed)

Williams DA, Thorn BE. An empirical assessment of pain beliefs. Pain. 1989 Mar;36(3):351-358. doi: 10.1016/0304-3959(89)90095-X.

Reference Type BACKGROUND
PMID: 2710564 (View on PubMed)

Jensen MP, Turner JA, Romano JM, Lawler BK. Relationship of pain-specific beliefs to chronic pain adjustment. Pain. 1994 Jun;57(3):301-309. doi: 10.1016/0304-3959(94)90005-1.

Reference Type BACKGROUND
PMID: 7936708 (View on PubMed)

Rosenstiel AK, Keefe FJ. The use of coping strategies in chronic low back pain patients: relationship to patient characteristics and current adjustment. Pain. 1983 Sep;17(1):33-44. doi: 10.1016/0304-3959(83)90125-2.

Reference Type BACKGROUND
PMID: 6226916 (View on PubMed)

Keefe FJ, Crisson J, Urban BJ, Williams DA. Analyzing chronic low back pain: the relative contribution of pain coping strategies. Pain. 1990 Mar;40(3):293-301. doi: 10.1016/0304-3959(90)91126-4.

Reference Type BACKGROUND
PMID: 2139204 (View on PubMed)

Keefe FJ, Caldwell DS, Martinez S, Nunley J, Beckham J, Williams DA. Analyzing pain in rheumatoid arthritis patients. Pain coping strategies in patients who have had knee replacement surgery. Pain. 1991 Aug;46(2):153-160. doi: 10.1016/0304-3959(91)90070-E.

Reference Type BACKGROUND
PMID: 1749638 (View on PubMed)

Nielson WR, Walker C, McCain GA. Cognitive behavioral treatment of fibromyalgia syndrome: preliminary findings. J Rheumatol. 1992 Jan;19(1):98-103.

Reference Type BACKGROUND
PMID: 1556709 (View on PubMed)

Lorig K, Chastain RL, Ung E, Shoor S, Holman HR. Development and evaluation of a scale to measure perceived self-efficacy in people with arthritis. Arthritis Rheum. 1989 Jan;32(1):37-44. doi: 10.1002/anr.1780320107.

Reference Type BACKGROUND
PMID: 2912463 (View on PubMed)

Williams DA, Robinson ME, Geisser ME. Pain beliefs: assessment and utility. Pain. 1994 Oct;59(1):71-78. doi: 10.1016/0304-3959(94)90049-3.

Reference Type BACKGROUND
PMID: 7854805 (View on PubMed)

Lipchik GL, Milles K, Covington EC. The effects of multidisciplinary pain management treatment on locus of control and pain beliefs in chronic non-terminal pain. Clin J Pain. 1993 Mar;9(1):49-57. doi: 10.1097/00002508-199303000-00007.

Reference Type BACKGROUND
PMID: 8477140 (View on PubMed)

Jensen MP, Keefe FJ, Lefebvre JC, Romano JM, Turner JA. One- and two-item measures of pain beliefs and coping strategies. Pain. 2003 Aug;104(3):453-469. doi: 10.1016/S0304-3959(03)00076-9.

Reference Type BACKGROUND
PMID: 12927618 (View on PubMed)

Jensen MP, Turner JA, Romano JM, Strom SE. The Chronic Pain Coping Inventory: development and preliminary validation. Pain. 1995 Feb;60(2):203-216. doi: 10.1016/0304-3959(94)00118-X.

Reference Type BACKGROUND
PMID: 7784106 (View on PubMed)

Nguyen TD, Attkisson CC, Stegner BL. Assessment of patient satisfaction: development and refinement of a service evaluation questionnaire. Eval Program Plann. 1983;6(3-4):299-313. doi: 10.1016/0149-7189(83)90010-1.

Reference Type BACKGROUND
PMID: 10267258 (View on PubMed)

Walters SJ, Brazier JE. What is the relationship between the minimally important difference and health state utility values? The case of the SF-6D. Health Qual Life Outcomes. 2003 Apr 11;1:4. doi: 10.1186/1477-7525-1-4.

Reference Type BACKGROUND
PMID: 12737635 (View on PubMed)

Lachin JM. Introduction to sample size determination and power analysis for clinical trials. Control Clin Trials. 1981 Jun;2(2):93-113. doi: 10.1016/0197-2456(81)90001-5.

Reference Type BACKGROUND
PMID: 7273794 (View on PubMed)

Other Identifiers

Review additional registry numbers or institutional identifiers associated with this trial.

DAMD 17-002-0018, A-9356.1

Identifier Type: -

Identifier Source: org_study_id