作者单位：Harvard Univ, Boston, MA 02115 USA[1]Harvard Univ, Massachusetts Gen Hosp, Sch Med, Comp Sci Lab, Boston, MA USA[2]Harvard Univ, Massachusetts Gen Hosp, Sch Med, Div Gen Internal Med,Med Serv, Boston, MA USA[3]Harvard Univ, Massachusetts Gen Hosp, Sch Med, Mongan Inst Hlth Policy, Boston, MA USA[4]Kaiser Permanente No Calif, Div Res, Oakland, CA USA[5]
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