[1] Univ Iowa, Dept Pediat, Iowa City, IA 52242 USA
[2] Joslin Diabet Ctr, Boston, MA USA
[3] Univ Chicago, Chicago, IL 60637 USA
[4] Kaiser Permanente So Calif, Dept Res & Epidemiol, Gardena, CA 90249 USA
[5] Univ Michigan, Child Hlth Evaluat & Res Unit, Ann Arbor, MI 48109 USA
[6] Yale Univ, Sch Med, New Haven, CT 06520 USA