1. State Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, P.R. China
2. Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, Guangdong, P.R. China
3. School of Public Health and Management, Chongqing Medical University, Chongqing, People’s Republic of China