1. Endocrine Research Unit (J.D.V.), Department of Internal Medicine, Mayo Medical School, Mayo School of Graduate Medical Education, General Clinical Research Center, Mayo Clinic, Rochester, Minnesota 55905;
2. Department of Pediatrics (J.N.R.), State University of New York at Buffalo, Buffalo, New York 14214-3000;
3. Pediatric Endocrinology (E.J.R.), National Children’s Hospital, San Jose 1000, Costa Rica;
4. Division of Endocrinology and Metabolism (C.Y.B.), Department of Internal Medicine, Tulane University Medical Center, New Orleans, Louisiana 70112-2699