[1] HARVARD UNIV,SCH MED,CHANNING LAB,DEPT MED,180 LONGWOOD AVE,BOSTON,MA 02115
[2] BRIGHAM & WOMENS HOSP,BOSTON,MA 02115
[3] HARVARD UNIV,SCH PUBL HLTH,DEPT HLTH POLICY & MANAGEMENT,BOSTON,MA 02115
[4] HARVARD UNIV,SCH PUBL HLTH,DEPT EPIDEMIOL,BOSTON,MA 02115