[1] COLUMBIA UNIV, SCH PUBL HLTH, DIV MICROBIOL, NEW YORK, NY 10027 USA
[2] COLUMBIA UNIV TEACHERS COLL, DEPT HLTH EDUC, NEW YORK, NY 10027 USA
[3] COLUMBIA UNIV TEACHERS COLL, CTR HLTH PROMOT, NEW YORK, NY 10027 USA
[4] NEW YORK STATE DEPT HLTH, MARY LASKER HEART & HYPERTENS INST, ALBANY, NY 12201 USA
[5] NEW YORK STATE DEPT HLTH, CTR COMMUNITY HLTH, ALBANY, NY 12201 USA