1. Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM); Instituto de Salud Carlos III, Madrid; Spain
2. Department of Endocrinology and Nutrition; Hospital Regional Universitario de Málaga, IBIMA; Málaga Spain
3. UGC de Laboratorio (Bioquímica); Hospital Regional Universitario de Málaga; Málaga Spain
4. CIBER de Fisiopatología de la Obesidad y Nutrición (CIBEROBN); Instituto de Salud Carlos III, Madrid; Spain
5. Department of Endocrinology and Nutrition; Hospital del Mar; Barcelona Spain
6. Hospital Universitario Cruces, BioCruces, UPV/EHU; Barakaldo Spain
7. Department of Endocrinology and Nutrition; Hospital Universitario S. Carlos de Madrid; Spain
8. Laboratorio de Bioquímica; Hospital Universitario S. Carlos de Madrid; Spain
9. Public Health Agency, Department of Health; Autonomous Government of Catalonia; Barcelona Spain
10. Department of Endocrinology and Nutrition; Hospital Central de Asturias; Oviedo Spain
11. EAP Raval Sud, Institut Català de la Salut, Red GEDAPS, Primary Care, Unitat de Suport a la Recerca (IDIAP - Fundació Jordi Gol); Barcelona Spain
12. Department of Endocrinology and Nutrition; Hospital Universitario Cruces - UPV-EHU; Baracaldo Spain
13. Diabetes Unit; Hospital Arnau de Vilanova; Valencia Spain
14. Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Hospital Clínic de Barcelona; Spain
15. Department of Endocrinology and Nutrition; Hospital Universitario Joan XXIII, Institut d'Investigacions Sanitaries Pere Virgili; Tarragona Spain
16. Genotyping and Genetic Diagnosis Unit; Fundación de Investigación del Hospital Clínico de Valencia-INCLIVA; Valencia Spain