Affiliation: | 1. Fetal Medicine Unit, Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, China Department of Ultrasound, Shenzhen People's Hospital, Jinan University, China;2. Department of Ultrasound, Shenzhen People's Hospital, Jinan University, China;3. Fetal Medicine Unit, Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, China |