[1] Univ Ibadan, Coll Med, Dept Obster & Gynecol, Gynecol Oncol Unit, Ibadan, Nigeria
[2] NIH, Bethesda, MD 20892 USA
[3] Univ Maryland, Sch Med, Baltimore, MD 21201 USA
[4] NCI, Bethesda, MD 20892 USA
[5] Fred Hutchinson Canc Res Ctr, Seattle, WA USA
[6] Mansoura Univ, Mansoura, Egypt
[7] ARC NET Canc Res Ctr, Verona, Italy
[8] London Sch Hyg & Trop Med, London, England
[9] Univ Florida, Gainesville, FL 32611 USA
[10] Univ Penn, Philadelphia, PA 19104 USA
[11] Amer Canc Soc, Atlanta, GA 30329 USA
[12] Union Int Canc Control, Geneva, Switzerland
[13] Univ Warwick, Coventry CV4 7AL, W Midlands, England
[14] Univ Oxford, Oxford OX1 2JD, England