1. Department of Radiology, Affiliated Hospital of Chengdu University, Chengdu, Sichuan, China (mainland)
2. Department of Radiology, Suining Center Hospital, Suining, Sichuan, China (mainland)
3. Department of Radiology, The Ninth People’s Hospital of Chongqing, Chongqing, China (mainland)
4. Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, China (mainland)