Affiliation: | 1. Department of Ultrasound, Shenzhen Maternity & Child Healthcare Hospital, Southern Medical University, Shenzhen, Guangdong, China;2. Department of Obstetrics & Gynecology, School of Medicine, University of Connecticut, Farmington, CT, USA;3. Department of Central Laboratory, Shenzhen Maternity & Child Healthcare Hospital, Southern Medical University, Shenzhen, Guangdong, China |