[1] UNIV WISCONSIN, SCH MED, DEPT MED, GEN INTERNAL MED SECT, MADISON, WI USA
[2] NCI, DIV CANC PREVENT & CONTROL, CANC CONTROL SCI PROGRAM, BETHESDA, MD 20892 USA
[3] NCI, SMOKING TOBACCO & CANC PROGRAM, BETHESDA, MD USA
[4] AMER ACAD PEDIAT, DEPT EDUC, WASHINGTON, DC USA
[5] YALE UNIV, SCH MED, DEPT MED, NEW HAVEN, CT 06510 USA
[6] YALE UNIV, SCH MED, DEPT EPIDEMIOL, NEW HAVEN, CT USA
[7] YALE UNIV, SCH MED, DEPT PUBL HLTH, NEW HAVEN, CT 06510 USA
[8] ASSOC AMER MED COLL, WASHINGTON, DC USA
[9] DOCTORS OUGHT CARE, HOUSTON, TX USA
[10] HOWARD UNIV, COLL MED, ASSOC MED SCH PEDIAT, WASHINGTON, DC USA
[11] HARVARD UNIV, SCH MED, BOSTON, MA USA
[12] UNIV WISCONSIN, SCH MED, DEPT PEDIAT, MADISON, WI USA
[13] UNIV WISCONSIN, SCH MED, DEPT PREVENT MED, MADISON, WI USA
[14] NCI, APPLICAT PREVENT & EARLY DETECT SECT, BETHESDA, MD USA
[15] UNIV IOWA, COLL MED, IOWA CITY, IA USA
[16] UNIV CALIF LOS ANGELES, SCH MED, LOS ANGELES, CA USA