[1] IRCCS, Res Unit Diabetol & Endocrinol, San Giovanni Rotondo, Italy
[2] IRCCS, Unit Endocrinol, San Giovanni Rotondo, Italy
[3] Joslin Diabet Ctr, Boston, MA 02215 USA
[4] IRCCS, Biostat Unit, San Giovanni Rotondo, Italy
[5] Harvard Univ, Sch Med, Boston, MA USA
[6] Univ Roma La Sapienza, I-00185 Rome, Italy