1. Department of Medicine, Klinikum Innenstadt, Ludwig Maximilians University (O.E.J., S.T.A., H.G.), D-80336 Munich, Germany
2. the Department of Pediatric Endocrinology and Metabolism, Baylor College of Medicine (S.K.G.), Houston, Texas 77030
3. the Departments of Medicine and Pediatrics and J. P. Kennedy, Jr., Mental Retardation Research Center, University of Chicago (S.R.), Chicago, Illinois 60637