1. Department of Pediatrics (D.A., H.J.N., S.W., C.J.R., S.R.), Johns Hopkins University School of Medicine, Baltimore, Maryland 21287
2. Research and Development Division (R.K., R.M.L.), Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois 60612
3. Division of Endocrinology, Department of Pediatrics (F.W.), Division of Metabolism, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287