1 Department of Endocrinology and Nutrition, Clínica Universidad de Navarra, University of Navarra, IdiSNA, CIBEROBN, 31008 Pamplona, Spain.
2 Division of Internal Medicine "Augusto Murri", Department of Biomedical Sciences and Human Oncology, Policlinico Hospital, University of Bari "Aldo Moro", Bari, Italy.
3 Department of Endocrinology and Nutrition, Clínica Universidad de Navarra, University of Navarra, IdiSNA, CIBEROBN, 31008 Pamplona, Spain. Electronic address: gfruhbeck@unav.es.