1. Sleep Unit, Department of Respiratory Medicine, Hospital Universitari de Bellvitge, Hospitalet de Llobregat, Spain
2. Section of Respiratory Medicine, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain
3. Universtitat Autonoma de Barcelona, Department of Medicine, Barcelona, Spain
4. Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBERES), Spain
5. Sleep Unit, Department of Respiratory Medicine, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
6. Sleep Unit, Department of Respiratory Medicine, Hospital Clinic de Barcelona, Barcelona, Spain
7. Respiratory Diseases Research Unit, Hospital Universitari Arnau de Vilanova, IRB Lleida Lleida, Spain
8. Clinic Analysis Service, Hospital Universitari Son Espases, Palma de Mallorca, Spain
9. Department of Endocrinology and Nutrition, Hospital Universitari de Bellvitge, Hospitalet de Llobregat, Spain
10. CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Barcelona, Spain