1 Department of Obstetrics & Gynecology, Princess Margaret Hospital, 2-10 Princess Margaret Hospital Road, Lai Chi Kok, Kowloon, Hong Kong, China. Electronic address: [email protected].
2 Prenatal Diagnostic Laboratory, Tsan Yuk Hospital, and Department of Obstetrics and Gynecology, Queen Mary Hospital, Hong Kong, China.
3 Department of Obstetrics & Gynecology, Tuen Mun Hospital, Hong Kong, China.
4 Department of Obstetrics & Gynecology, United Christian Hospital, Hong Kong, China.
5 Department of Obstetrics & Gynecology, Queen Elizabeth Hospital, Hong Kong, China.
6 Department of Obstetrics & Gynecology, Pamela Youde Nethersole Easten Hospital, Hong Kong, China.