1. From the Dartmouth Institute for Health Policy and Clinical Practice (J.R.B., G.T.O., D.J.M.), Dartmouth College, Lebanon, NH; the Section of Cardiology (J.R.B., J.F.R., A.V.K., D.J.M.) and the Section of Nephrology/Hypertension (C.A.B., A.C.S.), Department of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH; and the Department of Renal Services (R.J.S.), Fletcher Allen Health Care, Burlington, VT.