1. Department of Kidney Disease & Blood Purification Treatment, Tianjin Institute of Urology, the Second Hospital of Tianjin Medical University, Tianjin 300211, PR China
2. Nephrology Department of Chinese PLA 254 Hospital, Tianjin 300142, PR China
3. Department of Radiology, the Second Hospital of Tianjin Medical University, Tianjin 300211, PR China