[1] NCI, Interdisciplinary Studies Sect, Environm Epidemiol Branch, Div Canc Epidemiol & Genet, Rockville, MD 20852 USA
[2] Int Agcy Res Canc, F-69372 Lyon, France
[3] Johns Hopkins Med Inst, Dept Pathol, Baltimore, MD 21205 USA
[4] Costa Rican Social Secur Adm, San Jose, Costa Rica
[5] Brown Univ, Women & Infants Hosp, Providence, RI USA
[6] Omnia, Blue Bell, PA USA
[7] Digene Corp, Silver Spring, MD USA