[1] Univ Penn, Dept Med, Div Endocrinol Diabet & Metab, Philadelphia, PA 19104 USA
[2] Univ Penn, Penn Diabet Ctr, Philadelphia, PA 19104 USA
[3] W Virginia Univ, Dept Physiol & Pharmacol, Morgantown, WV 26506 USA
[4] Albert Einstein Coll Med, Dept Cell Biol, Bronx, NY 10461 USA
[5] Albert Einstein Coll Med, Ctr Diabet Res & Training, Bronx, NY 10461 USA