9Schoell WM,Janicek MF,Mirhashemi R.Epidemiology and biology of cervical cancer.Semin Surg Oncol,1999,16:203-211.
10Svare EI,Kjaer SK,Worm AM,et al.Risk factors for HPV infection in women from sexually transmitted disease clinics:Comparison between two areas with different cervical cancer incidence.Int J Cancer,1998,75:1-8.
