1. From the Departments of Epidemiology and Biostatistics (J.L.B., M.G.M.H.) and Radiology (M.G.M.H.), Erasmus Medical Center, Rotterdam, Netherlands; Julius Center for Patient Oriented Research (Y.v.d.G), University Hospital, Utrecht, Netherlands; School of Medicine, Keio University (J.L.B.), Tokyo, Japan; and the Harvard School of Public Health (M.G.M.H.), Boston, Mass.