[1] Univ Virginia Hlth Syst, Dept Med, Div Infect Dis & Int Hlth, Charlottesville, VA 22908 USA
[2] Univ Virginia Hlth Syst, Dept Pharm, Charlottesville, VA 22908 USA
[3] Univ Virginia Hlth Syst, Dept Surg, Charlottesville, VA 22908 USA
[4] Ctr Dis Control & Prevent, Div Healthcare Qual Promot, Atlanta, GA USA
[5] Univ Virginia Hlth Syst, Dept Pathol, Charlottesville, VA 22908 USA