1. Clinical Neurocardiology Section (J.N.P., D.S.G., G.E.), National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892
2. St. Bartholomew’s and The Royal London School of Medicine (S.W.C.), London E1 1BB, United Kingdom
3. Endocrine Research Unit (J.M.M.), Mayo Clinic, Rochester, Minnesota 55905