1. a Department of Child and Adolescent Psychiatry and Psychology , Institut Clínic de Neurociències, Hospital Clínic Universitari , Barcelona , Spain
2. b Department of Psychiatry , University Hospital Vall d'Hebron, CIBERSAM, Universitat Autònoma de Barcelona , Barcelona , Spain
3. c Department of Psychiatry and Forensic Medicine , Universitat Autònoma de Barcelona , Barcelona , Spain
4. e Section of Clinical & Health Psychology, School of Health in Social Sciences , The University of Edinburgh , Edinburgh , United Kingdom
5. d Chronic Fatigue Unit, Department of Internal Medicine , University Hospital Vall d'Hebron, Universitat Autònoma de Barcelona , Barcelona , Spain