[1] Univ Penn, Pulm Allergy & Crit Care, Philadelphia, PA 19104 USA
[2] Univ Penn, Family Med & Community Hlth, Philadelphia, PA 19104 USA
[3] Univ Penn, Biostat & Epidemiol, Philadelphia, PA 19104 USA
[4] Henry Ford Hlth Syst, Publ Hlth Sci, Detroit, MI USA
[5] Marshfield Clin Res Inst, Marshfield, WI USA
[6] Kaiser Permanente Colorado, Inst Hlth Res, Denver, CO USA
[7] Hawaii Permanente Med Grp, Ctr Hlth Res, Kaiser Permanente Hawaii, Oahu, HI USA
[8] Henry Ford Hosp, Pulm & Crit Care Med, Detroit, MI 48202 USA
[9] Univ Penn, Gen Internal Med, Philadelphia, PA 19104 USA
[10] Univ Michigan, Epidemiol, Ann Arbor, MI 48109 USA