1. Reproductive Biology and Medicine Branch (H.J.L.M.T., A.K., K.T.A., D.S., K.P.), National Institutes of Health, Bethesda, Maryland 20892-1109
2. Division of General Internal Medicine, and Department of Endocrinology (H.J.L.M.T.), Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, The Netherlands
3. National Institute of Child Health and Human Development, Clinical Neurocardiology Section (G.E.), National Institutes of Health, Bethesda, Maryland 20892-1109
4. National Institute of Neurological Disorders and Stroke, and Laboratory of Clinical Genetics (M.R.), National Institutes of Health, Bethesda, Maryland 20892-1109
5. Department of Internal Medicine (J.W.M.L.), Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, The Netherlands