1. From the Terrence Donnelly Research Laboratories (M.P.B., D.M.), Division of Cardiology, St. Michael’s Hospital, and the Departments of Medicine and Laboratory Medicine and Pathobiology (M.P.B., D.M.), University of Toronto, Toronto, Ontario, Canada; the Department of Pathology (C.I., M.R., L.S., C.M.G.), University of Washington, Seattle; and the Bone and Mineral Centre (M.H.), Department of Medicine, Royal Free and University College Medical School, London, UK.