1. Division of Ultrasound, West China Hospital of Sichuan University, Chengdu, Sichuan, China;
2. Department of Nephrology, Nanchong Central Hospital, Nanchong, Sichuan, China;
3. Sichuan Center for Disease Control and Prevention, Chengdu, Sichuan, China;
4. West China Hospital of Sichuan University, Chengdu, Sichuan, China;
5. Kidney Research Institute, Department of Internal Medicine, Division of Nephrology, West China Hospital of Sichuan University, Chengdu, Sichuan, China