1. Department of Ultrasound, Shenzhen Second People’s Hospital, The First Affiliated Hospital of Shenzhen University, Sungang West Road 3002, Futian District, Shenzhen 518025, China
2. Graduate School, Guangzhou Medical University, Guangzhou 510180, China
3. Department of Ultrasound, Heping People’s Hospital, Dongshan Road 10, Yangming Town, Heping County, Heyuan 517299, China