[1] Univ Maryland, Div Infect Dis, Med Ctr, Baltimore, MD 21201 USA
[2] Univ Maryland, Dept Epidemiol & Publ Hlth, Sch Med, Baltimore, MD 21201 USA
[3] VA Maryland Hlth Care Syst, Dept Pharm, Baltimore, MD USA
[4] Univ Maryland, Div Infect Dis, Sch Med, Baltimore, MD 21201 USA
[5] VA Maryland Hlth Care Syst, Dept Med, Baltimore, MD USA
[6] VA Maryland Hlth Care Syst, Geriatr Res Educ & Clin Ctr, Baltimore, MD USA