作者单位:Brigham & Womens Hosp, Dept Med, Boston, MA 02115 USA[1]JSI Res & Training Inst, Boston, MA USA[2]RAND Corp, 1776 Main St, Santa Monica, CA 90401 USA[3]Harvard Univ, Ctr AIDS Res, Cambridge, MA 02138 USA[4]Yale Univ, Sch Publ Hlth, Dept Social & Behav Sci, New Haven, CT 06520 USA[5]