1. Department of Gynecology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
2. Department of Gynecology, The First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang 150040, P.R. China
3. Department of Breast Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China