[1] NIH, Dept Crit Care Med, Ctr Clin, Bethesda, MD 20892 USA
[2] Univ Zurich Hosp, Div Infect Dis & Hosp Epidemiol, Zurich, Switzerland
[3] Natl Ctr Global Hlth & Med, AIDS Clin Ctr, Tokyo, Japan
[4] Kumamoto Univ, Ctr AIDS Res, Div 9, Kumamoto 860, Japan