Endocrinology Laboratory Unit, "Luigi Sacco" University Hospital, Università degli Studi di Milano, ASST Fatebenefratelli-Sacco, Milan, Italy. Medical Statistics Unit, Department of Biomedical and Clinical Sciences L. Sacco, "Luigi Sacco" University Hospital, Università degli Studi di Milano, Milan, Italy. Electronic address: giacomo.biganzoli@studenti.unimi.it. Clinical Pharmacology Unit, Department of Biomedical and Clinical Sciences L. Sacco, "Luigi Sacco" University Hospital, Università degli Studi di Milano, Milan, Italy. Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy. Medical Statistics Unit, Department of Biomedical and Clinical Sciences L. Sacco, "Luigi Sacco" University Hospital, Università degli Studi di Milano, Milan, Italy. Clinical Pharmacology Unit, Department of Biomedical and Clinical Sciences L. Sacco, "Luigi Sacco" University Hospital, Università degli Studi di Milano, Milan, Italy; Scientific Institute, IRCCS E. Medea, Bosisio Parini, LC, Italy.