Affiliation: | 1. Department of Biostatistics, University of Michigan, Ann Arbor, Michigan 48109, U.S.A.;2. Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, U.S.A.;3. Kidney Epidemiology and Cost Center, University of Michigan, Ann Arbor, Michigan 48109, U.S.A. |