Author(s) affiliations:Paola Maffi, Marina Scavini, Carlo Socci, Lorenzo Piemonti, Rossana Caldara, Chiara Gremizzi, Raffaella Melzi, Rita Nano, Elena Orsenigo, Massimo Venturini, Carlo Staudacher, Alessandro Del Maschio, and Antonio Secchi
Diabetes Research Institute, San Raffaele Scientific Institute, Via Olgettina 60, 20132 Milano, Italy.