1. Endocrinology & Nutrition Department, Instituto de Investigación Sanitaria Fundación Jiménez Díaz (IIS FJD, UAM), Hospital Universitario Fundación Jiménez Díaz , 28040 Madrid , Spain
2. Endocrinology & Nutrition Department, OSI Bilbao-Basurto, Medicine Department, Basque Country University, Hospital Universitario de Basurto , 48013 Bilbao , Spain
3. Endocrinology & Nutrition Department, Hospital Universitario de Castellón , 12004 Castellón , Spain
4. Endocrinology & Nutrition Department, Instituto de Investigación Biomédica Ramón y Cajal (IRYCIS), Hospital Universitario Ramón y Cajal , 28034 Madrid , Spain
5. Biochemistry Department, Hospital Universitario Ramón y Cajal , 28034 Madrid , Spain
6. Endocrinology & Nutrition Department, Hospital Universitario La Paz , 28046 Madrid , Spain
7. Endocrinology & Nutrition Department, Hospital Universitario de Toledo , 45007 Toledo , Spain
8. Endocrinology & Nutrition Department, Hospital Universitario de Valladolid , 47003 Valladolid , Spain
9. Endocrinology & Nutrition Department, Hospital Universitario de La Princesa , 28006 Madrid , Spain
10. General & Digestive Surgery Department, Hospital Universitario de La Princesa , 28006 Madrid , Spain
11. Endocrinology & Nutrition Department, Institut Català de la Salut Girona , 17007 Girona , Spain
12. Endocrinology & Nutrition Department, Hospital Universitario Virgen de la Victoria de Málaga, IBIMA , 29010 Málaga , Spain
13. CIBEROBN , 28029 Madrid , Spain
14. Endocrinology & Nutrition Department, Hospital Universitario Infanta Sofía , 28702 Madrid , Spain
15. Endocrinology & Nutrition Department, Hospital Universitario Virgen de la Macarena , 41009 Sevilla , Spain
16. Endocrinology & Nutrition Department, Clínica Universidad de Navarra , 31008 Pamplona , Spain
17. Endocrinology & Nutrition Department, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Hospital Universitario Central de Asturias , 33011 Oviedo , Spain
18. Endocrinology & Nutrition Department, Hospital Universitario Gregorio Marañón , 28007 Madrid , Spain
19. Endocrinology & Nutrition Department, Hospital Reina Sofía , 14004 Córdoba , Spain
20. Endocrinology & Nutrition Department, Hospital Royo Villanova , 50015 Zaragoza , Spain
21. Endocrinology & Nutrition Department, Complejo Universitario de Salamanca , 37007 Salamanca , Spain
22. Biochemistry and Molecular Genetics Department-CDB, Hospital Clinic, IDIBAPS, CIBERehd , 08036 Barcelona , Spain
23. Endocrinology & Nutrition Department, Hospital Clinic, IDIBAPS, CIBERDEM, Universitat de Barcelona , 08036 Barcelona , Spain
24. Department of Medicine, University of Alcalá , 28801 Madrid , Spain