[1] Univ Michigan, Sch Nursing, 400 N Ingalls,Room 4306, Ann Arbor, MI 48109 USA
[2] VA Ann Arbor Healthcare Syst, VA Ctr Clin Management Res, Ann Arbor, MI USA
[3] Agcy Healthcare Res & Qual, Div Healthcare Associated Infect, Ctr Qual Improvement & Patient Safety, Rockville, MD USA
[4] Univ Michigan, Sch Med, VA Ctr Clin Management Res, VA Ann Arbor Healthcare Syst, Ann Arbor, MI USA
[5] Univ Michigan, Sch Med, Dept Internal Med, Ann Arbor, MI USA