Internet-Based Cognitive Behavioral Therapy in Stepped Care for Chronic Fatigue Syndrome: Randomized Noninferiority Trial

Margreet Worm-Smeitink   ^{1, 2} , MSc ;   Anthonie Janse   ³ , MSc ;   Arno van Dam   ⁴ , PhD ;   Andrea Evers   ^{5, 6} , Prof Dr ;   Rosalie van der Vaart   ⁵ , PhD ;   Michel Wensing   ^{7, 8} , Prof Dr ;   Hans Knoop   ^{3, 9} , Prof Dr

¹ Department of Medical Psychology, Radboud University Medical Center, Nijmegen, Netherlands

² Specialist Center for Complex Medically Unexplained Symptoms and Somatic Symptom Disorders, Dimence, Deventer, Netherlands

³ Department of Medical Psychology, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, Netherlands

⁴ Tranzo, School of Social and Behavioural Sciences, Tilburg University, Tilburg, Netherlands

⁵ Health, Medical and Neuropsychology Unit, Institute of Psychology, Leiden University, Leiden, Netherlands

⁶ Department of Psychiatry, Leiden University Medical Center, Leiden, Netherlands

⁷ Department of General Practice and Health Services Research, Heidelberg University Hospital, Heidelberg, Germany

⁸ Radboud Institute of Health Sciences, Radboud University Medical Center, Nijmegen, Netherlands

⁹ Expert Center for Chronic Fatigue, Department of Medical Psychology, Amsterdam University Medical Centers, Vrije Universiteit, Amsterdam, Netherlands