1. Endocrinology & Nutrition Department, Hospital Universitario Ramón y Cajal, 28034 Madrid, Spain
2. Instituto de Investigación Biomédica Ramón y Cajal (IRYCIS), 28034 Madrid, Spain
3. Medicine Department, University of Alcalá, 28801 Madrid, Spain
4. Endocrinology & Nutrition Department, OSI Bilbao-Basurto, Hospital Universitario de Basurto, 48013 Bilbao, Spain
5. Medicine Department, Basque Country University, 48013 Bilbao, Spain
6. Endocrinology & Nutrition Department, Hospital Universitario de Castellón, 12004 Castellón, Spain
7. Biochemistry Department, Hospital Universitario Ramón y Cajal, 28034 Madrid, Spain
8. Endocrinology & Nutrition Department, Hospital Universitario La Paz, 28046 Madrid, Spain
9. Endocrinology & Nutrition Department, Hospital Universitario de Toledo, 45007 Toledo, Spain
10. Endocrinology & Nutrition Department, Hospital Universitario de Vall Hebron, 08035 Barcelona, Spain
11. General & Digestive Surgery Department, Hospital Universitario de La Princesa, 28006 Madrid, Spain
12. Endocrinology & Nutrition Department, Hospital Universitario Infanta Sofía, 28702 Madrid, Spain
13. Endocrinology & Nutrition Department, Complejo Universitario de Salamanca, 37007 Salamanca, Spain
14. Endocrinology & Nutrition Department, Hospital Universitario La Princesa, 28006 Madrid, Spain
15. Endocrinology & Nutrition Department, Hospital Virgen de la Macarena, 41009 Sevilla, Spain
16. Endocrinology & Nutrition Department, Hospital Joan XXIII, 43005 Tarragona, Spain
17. Internal Medicine, Hospital Infanta Leonor de Vallecas, 28031 Madrid, Spain
18. Endocrinology & Nutrition Department, Hospital Clinic, IDIPAS, 08007 Barcelona, Spain