1. The Fleischer Institute for Diabetes and Metabolism, Department of Medicine, Albert Einstein College of Medicine, Bronx, New York, USA.
2. Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA.
3. Department of Clinical and Experimental Medicine, Endocrinology Unit II, University of Pisa and University Hospital of Pisa, Pisa, Italy.
4. Department of Family and Social Medicine, Albert Einstein College of Medicine, Bronx, New York, USA.