1. Medicine and Research Services (L.A., D.W., C.Q., D.T.V., R.A.-V.), New Mexico Veterans Affairs Health Care System, Albuquerque, New Mexico
2. Biomedical Research Institute of New Mexico (L.A., C.Q.), Albuquerque, New Mexico 87108
3. Department of Medicine (N.N., D.T.V.), Washington University School of Medicine, St Louis, Missouri 63110
4. Department of Medicine (N.N.), Campus Biomedico, 00128 Rome, Italy
5. Department of Preventive and Social Medicine (D.W.), University of Otago, Dunedin 9054, New Zealand
6. Departments of Medicine, Mathematics, and Statistics (C.Q., D.T.V., R.A.-V.), University of New Mexico, Albuquerque, New Mexico 87131