Affiliation: | (1) the Department of Community and Family Medicine, Division of Biometry and Medical Informatics, Duke University, Durham, North Carolina;(2) Division of Occupational and Environmental Medicine, Duke University, Durham, North Carolina;(3) the Department of Medicine, Division of General Internal Medicine, Duke University, Durham, North Carolina;(4) Present address: Henry Ford Health System, Detroit, Michigan;(5) Present address: Southeast Permanente Medical Group, Durham, North Carolina;(6) Henry Ford Health System, Division of Biostatistics, Research Epidemiology and Computing, 23725 Northwestern, 48075 Southfield, MI |