Institution: | 1. Prenatal Diagnostic and Counselling Department, Tsan Yuk Hospital, Hong Kong, China;2. Department of Obstetrics and Gynaecology, The University of Hong Kong, Hong Kong, China;3. Hong Kong Prenatal Diagnosis Centre, Hong Kong, China;4. Prenatal Diagnostic Laboratory Ltd. Hong Kong, China;5. Department of Obstetrics and Gynaecology, Kwong Wah Hospital, China;6. Department of Obstetrics and Gynaecology, Tuen Mun Hospital, China;7. Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, China;8. Dr. Y. Y. Kung's Clinic, Nathan Road, Kowloon, Hong Kong, China |