1. Department of Endocrinology and Nutrition, Hospital Universitario Fundación Alcorcón, 28922 Madrid, Spain
2. Department of Endocrinology and Nutrition, Hospital Universitario Gregorio Marañón, 28007 Madrid, Spain
3. Department of Endocrinology and Nutrition, Fundación Jiménez Díaz, 28040 Madrid, Spain
4. Department of Endocrinology and Nutrition, Hospital Universitario de Móstoles, 28935 Madrid, Spain
5. Department of Endocrinology and Nutrition, Hospital Universitario Puerta de Hierro, 28222 Madrid, Spain