1. Department of Internal Medicine, Unit of Metabolic Disease; University of Padova; Padova Italy
2. Department of Endocrinology and Nutrition; University of Oviedo; Oviedo Spain
3. Endocrinology and Nutrition Department; Hospital Universitario Central de Asturias; Oviedo Spain
4. Metabolism Unit; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA); Asturias Spain
5. Internal Medicine/Endocrinology and Clinical Sciences; University of Texas Southwestern Medical Center; Dallas TX USA