1. Unit of Endocrinology and Diabetes; Department of Medicine; Università Campus Bio-Medico di Roma; Rome Italy
2. Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS); Istituto Ortopedico Galeazzi; Milan Italy
3. Department of Epidemiology and Biostatistics; University of California; San Francisco CA USA
4. San Francisco Veterans Affairs Medical Center; San Francisco CA USA
5. California Pacific Medical Center; Research Institute; San Francisco CA USA
6. Oregon Health & Science University; Portland OR USA
7. Department of Epidemiology; Center for Aging and Population Health; Graduate School of Public Health; University of Pittsburgh; Pittsburgh PA USA
8. Department of Medicine; Stanford University; Stanford CA USA
9. Department of Medicine and Public Health; University of California; San Diego La Jolla, CA USA