2Aimercan College of obstetricians and Gynecologists.Acog practice bulletin clinical management guide lines for obstetrician-gynecologists Number 61,April 2005.Human Papillomavirus[J].Obstetric and Gynecology,2005,105(4):905-918.
4Shaw E,Sellors J,Kaczorowsld J.Prospective evaluation of colposcopic features in predicting cervical intraepithelial neoplasia[J].degree of acetowhite chang most important Low Genit Tract Dis,2003,7(1):6-10.