1. From the Clinical Pharmacology Unit (E.A.B.A., M.M., M.J.B., K.M.O.), Department of Medicine, Addenbrooke's Hospital, Cambridge, United Kingdom; Endocrine Hypertension Research Centre (M.S., R.G., B.K., S.X.), University of Queensland School of Medicine, Greenslopes and Princess Alexandra Hospital, Woolloongabba, Brisbane, Australia.