| Institution: | 1. Department of Obstetrics and Gynecology, Danbury Hospital, Danbury, CT, USA;2. Department of Ultrasound, Shenzhen Maternity and Child Healthcare Hospital, Affiliated to Southern Medical University, Shenzhen, Guangdong, China;3. Department of Obstetrics and Gynecology, Tufts Medical Center, Tufts University School of Medicine, Boston, MA, USA;4. Department of Ultrasound, Baoan Maternity and Child Healthcare Hospital, Shenzhen, Guangdong, China;5. Department of Ultrasound, Xiamen Maternity and Child Healthcare Hospital, Xiamen, Fujian, China |
