1. Department of Gynaecology, Handan Central Hospital, Handan, Hebei 056000, P.R. China
2. Department of General Surgery, Handan Central Hospital, Handan, Hebei 056000, P.R. China
3. Department of Emergency Surgery, Handan Central Hospital, Handan, Hebei 056000, P.R. China
4. Department of Gynaecology, Handan Central Hospital, Handan, Hebei 056000, P.R. China