1. New Mexico Clinical Research & Osteoporosis Center (E.M.L.), Albuquerque, New Mexico 87106
2. San Francisco Coordinating Center (S.R.C.), California Pacific Medical Center Research Institute and the Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California 94115
3. Regional Bone Center (F.C.), Helen Hayes Hospital, West Haverstraw, New York 10993
4. Department of Medicine (F.C.), Columbia University College of Physicians and Surgeons, New York, New York 10032