[1] JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT HLTH POLICY & MANAGEMENT,BALTIMORE,MD 21218
[2] JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT EPIDEMIOL,BALTIMORE,MD 21218
[3] YESHIVA UNIV ALBERT EINSTEIN COLL MED,BRONX,NY 10461
[4] GLAXO INC,RES TRIANGLE PK,NC