1. Division of General Internal Medicine (V.A.T, S.R., J.B.M.)
2. Division of Infectious Diseases (V.A.T.)
3. Massachusetts General Hospital, Boston. Department of Mathematics and Statistics (J.P., R.B.D.)
4. Boston University, MA. Center for Biostatistics in AIDS Research, Harvard T. H. Chan School of Public Health, Boston, MA (J.P.).
5. Department of Biostatistics, School of Public Health (J.M.M.)
6. Program in Nutritional Metabolism (S.K.G.)