1. CFS/ME Unit; Internal Medicine Service; Vall d'Hebron University Hospital Research Institute (VHIR); Universitat Autònoma de Barcelona; Barcelona Spain
2. Clinical Research Department; Laboratorios Viñas; Barcelona Spain
3. Psychiatry Unit; Sant Rafael Hospital (FIDMAG); Barcelona Spain
4. Sleep Unit; Clinical Neurophysiology Department; Vall d'Hebron University Hospital; Universitat Autònoma de Barcelona; Barcelona Spain
5. Instituto de Salud Carlos III; CIBER Enfermedades Respiratorias (CIBERES); Madrid Spain