1 Campania University "Luigi Vanvitelli", Department of Clinical and Experimental Medicine, Naples, Italy. Electronic address: s.gentile1949@gmail.com.
2 Campania University "Luigi Vanvitelli", Department of Clinical and Experimental Medicine, Naples, Italy. Electronic address: Giuseppina.GUARINO@unicampania.it.
3 Diabetes Unit, AID Portici, Italy. Electronic address: emimarte73@gmail.com.
4 Campania University "Luigi Vanvitelli", Department of Clinical and Experimental Medicine, Naples, Italy. Electronic address: tere.dellacorte@gmail.com.
5 San Raffaele Research Institute, Rome, Italy. Electronic address: felix.strollo@gmail.com.