[1] Univ Michigan, Dept Internal Med, 2800 Plymouth Rd,Bldg 16,Room 430W, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Sch Nursing, 400 North Ingalls Bldg,Room 4306, Ann Arbor, MI 48109 USA
[3] Vet Affairs Ann Arbor Healthcare Syst, Ctr Clin Management Res, POB 130170, Ann Arbor, MI 48113 USA
[4] Univ Michigan, Dept Internal Med, 2800 Plymouth Rd,NCRC Bldg 16,Room 430W, Ann Arbor, MI 48109 USA
[5] Univ Rochester, Infect Prevent Dept, Highland Hosp, 1000 South Ave, Rochester, NY 14620 USA
[6] North Carolina Healthcare Fdn, 2400 Weston Pkwy, Cary, NC 27513 USA
[7] Amer Hosp Assoc, Hlth Res & Educ Trust, 155 North Upper Wacker Dr,400, Chicago, IL 60606 USA