9Kohorn EI,Goldstein DP,Hancock BW,et al.Combining the staging system of the International Federation of Gynecology and obstetrics with the scoring system of the World Health Organizationfor trophoblastic neoplasia Report of the Working Committee ofthe International Society for the study of trophoblastic disease and the International Gynecologic Cancer Society[J].Int J gynecolcancer,2000,10 (1):84.
