1. Clinical Genetic Service Department of Health Hong Kong
2. Department of Obstetrics and Gynaecology Pamela Youde Nethersole Eastern Hospital Hong Kong
3. Department of Obstetrics and Gynaecology Princess Margaret Hospital Hong Kong
4. Department of Obstetrics and Gynaecology Queen Mary Hospital Hong Kong
5. Department of Obstetrics and Gynaecology Prince of Wales Hospital Hong Kong
6. Prenatal Diagnostic Laboratory Tsan Yuk Hospital Hong Kong
7. Department of Paediatrics & Adolescent Medicine The University of Hong Kong Hong Kong