1. Department of Endocrinology and Nutrition, Hospital Universitario Ramón y Cajal, Madrid, Spain.
2. Diabetes, Obesity and Human Reproduction Research Group, Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), CIBER Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Madrid, Spain.
3. Department of Medicine, University of Alcalá, Madrid, Spain.