1. Department of Obstetrics and Gynaecology Queen Mary Hospital the University of Hong Kong Hong Kong SAR China
2. Department of Obstetrics & Gynaecology Tuen Mun Hospital Hong Kong SAR China
3. Department of Obstetrics & Gynaecology Pamela Youde Nethersole Eastern Hospital Hong Kong SAR China
4. Department of Obstetrics & Gynaecology United Christian Hospital Hong Kong SAR China