1 San Raffaele Vita-Salute University, Milan, Italy.
2 Division of Endocrinology, Diabetes and Metabolism, School of Medicine, University of South Carolina, USA.
3 Division of Endocrinology, Diabetes and Metabolism, School of Medicine, University of South Carolina, USA; PROMISE Department, School of Medicine, University of Palermo, Italy. Electronic address: manfredi.rizzo@unipa.it.