1 Department of Clinical and Experimental Medicine, Second University of Naples, Naples, Italy.
2 Department of Pharmacological and Biomolecular Sciences, University of Milan, Milan, Italy.
3 Department of Endocrinology, Hospital Clinic de Barcelona, Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigacion Biomedica en Red de Diabetes y Enfermedades Metabolicas Asociadas (CIBERDEM), Barcelona, Spain.