1. From the Departments of Family and Preventive Medicine (M.H.C. and M.A.A.) and Medicine (M.H.C. and J.H.I.), University of California, San Diego, La Jolla, Calif; Collaborative Health Studies Coordinating Center, University of Washington, Seattle, Wash (A.K.); Division of Radiological Sciences, Wake Forest Univ. Health Sciences, Winston-Salem, NC (J.J.C.); Department of Pathology, University of Vermont, Colchester, Vt (M.C.); Department of Radiological Sciences (R.D.) and Division of Cardiology (N.D...