1. Department of Obstetrics and Gynecology Queen Mary Hospital the University of Hong Kong Hong Kong SAR China
2. Department of Obstetrics & Gynecology Tuen Mun Hospital Hong Kong SAR China
3. Department of Obstetrics & Gynecology Pamela Youde Nethersole Eastern Hospital Hong Kong SAR China
4. Department of Obstetrics & Gynecology Queen Elizabeth Hospital Hong Kong SAR China
5. Department of Obstetrics & Gynecology Kwong Wah Hospital Hong Kong SAR China