[1] MASSACHUSETTS GEN HOSP,MED PRACTICES EVALUAT CTR,BOSTON,MA 02114
[2] MASSACHUSETTS GEN HOSP,MED SERV,BOSTON,MA 02114
[3] HARVARD UNIV,SCH MED,BOSTON,MA
[4] UNIV PITTSBURGH,DEPT BIOSTAT,PITTSBURGH,PA 15261
[5] UNIV PITTSBURGH,DEPT HLTH SERV ADM,PITTSBURGH,PA 15261
[6] UNIV PITTSBURGH,DEPT MED,PITTSBURGH,PA 15261
[7] VICTORIA GEN HOSP,DEPT MED,HALIFAX,NS B3H 2Y9,CANADA
[8] VICTORIA GEN HOSP,DEPT MICROBIOL,HALIFAX,NS B3H 2Y9,CANADA
[9] DALHOUSIE UNIV,HALIFAX,NS,CANADA
[10] HARVARD UNIV,SCH PUBL HLTH,DEPT HLTH POLICY & MANAGEMENT,BOSTON,MA 02115
[11] UNIV TORONTO,DEPT HLTH ADM,TORONTO,ON M5S 1A1,CANADA
[12] UNIV TORONTO,DEPT MED,TORONTO,ON M5S 1A1,CANADA
[13] TORONTO HOSP,DIV GEN INTERNAL MED,TORONTO,ON,CANADA
[14] TORONTO HOSP,DIV CLIN EPIDEMIOL,TORONTO,ON,CANADA