[1] JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT EPIDEMIOL,BALTIMORE,MD
[2] STANFORD UNIV,STANFORD CTR RES DIS PREVENT,PALO ALTO,CA 94304
[3] UNIV IOWA HOSP & CLIN,DEPT OBSTET & GYNECOL,IOWA CITY,IA 52242
[4] UNIV MARYLAND,SCH MED,DEPT EPIDEMIOL & PREVENT MED,BALTIMORE,MD 21201
[5] NHLBI,DIV EPIDEMIOL & CLIN APPLICAT,BETHESDA,MD 20892
[6] NHLBI,DIV HEART & VASC DIS,LIPID METAB & ATHEROGENESIS BRANCH,BETHESDA,MD 20892