作者单位:Univ Calif San Francisco, Dept Med, San Francisco, CA 94143 USA[1]Tufts Med Ctr, Inst Clin Res & Hlth Policy Studies, Boston, MA 02111 USA[2]Boston Childrens Hosp, Computat Hlth Informat Program, Boston, MA 02115 USA[3]Tufts Med Ctr, Div Nephrol, Boston, MA 02111 USA[4]