Mónica Marazuela1, Andrea Giustina2, Manuel Puig-Domingo3. 1. Department of Endocrinology, Hospital Universitario de la Princesa, Instituto de Investigación de la Princesa, Universidad Autónoma de Madrid, Madrid, Spain. monica.marazuela@salud.madrid.org. 2. Division of Endocrinology IRCCS San Raffaele Hospital, Institute of Endocrine and Metabolic Sciences Vita Salute San Raffaele University, Milan, Italy. 3. Endocrinology and Nutrition Service, Department of Medicine, Germans Trias i Pujol Research Institute and Hospital, Universitat Autònoma de Barcelona, Badalona, Spain.