[1] Univ Leipzig, Med Klin & Poliklin 3, Dept Internal Med 3, D-04103 Leipzig, Germany
[2] NICHHD, Dev Endocrinol Branch, NIH, Bethesda, MD 20892 USA
[3] Univ Miami, Sch Med, Dept Med, Miami, FL USA
[4] US Dept Vet Affairs, Ctr Med, Miami, FL USA
[5] Univ Dusseldorf, Diabet Res Inst, D-4000 Dusseldorf, Germany