[1] Univ Maryland, Sch Med, Dept Epidemiol & Publ Hlth, Baltimore, MD 21201 USA
[2] VA Maryland Healthcare Syst, Baltimore, MD USA
[3] Univ Maryland, Sch Med, Dept Med, Div Gen Internal Med, Baltimore, MD 21201 USA
[4] Univ Maryland, Sch Pharm, Dept Pharmaceut Hlth Serv Res, Baltimore, MD 21201 USA