1. Department of Obstetrics and Gynecology Harbin Red Cross Central Hospital Harbin Heilongjiang China
2. Department of Obstetrics Yihe Maternity District of Cangzhou People's Hospital Cangzhou Hebei China
3. Department of Obstetrics and Gynecology Yihe Maternity District of Cangzhou People's Hospital Cangzhou Hebei China
4. Institute of Nano Electronic Engineering Universiti Malaysia Perlis (UniMAP) Kangar Perlis 01000 Malaysia
5. Faculty of Chemical Engineering Technology Universiti Malaysia Perlis (UniMAP) Arau Perlis 02600 Malaysia
6. Department of Gynecology Changzhou No. 2 People's Hospital, The Affiliated Hospital of Nanjing Medical University Changzhou Jiangsu 213003 China