[1] Boston VA Healthcare Syst, Sect Endocrinol Diabet & Metab, Boston, MA 02130 USA
[2] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Div Endocrinol Diabet & Metab, Dept Internal Med, Boston, MA 02115 USA
[3] Aristotle Univ Thessaloniki, Med Sch, Dept Pharmacol 1, Thessaloniki, Greece
[4] Univ Hosp Freiburg, Div Endocrinol, Dept Internal Med 2, Freiburg, Germany
[5] Univ Hosp Freiburg, Div Diabetol, Dept Internal Med 2, Freiburg, Germany
[6] Aristotle Univ Thessaloniki, Med Sch, Hippocrat Hosp, Propedeut Dept Internal Med 2, Thessaloniki, Greece
[7] Hallym Univ Sacred Heart Hosp, Dept Family Med, Gyeonggi Do, South Korea
[8] Yonsei Univ, Coll Med, Div Endocrinol & Metab, Dept Internal Med, Seoul, South Korea