Affiliation: | 1. Department of Nephrology, China-Japan Friendship Hospital, Beijing 100029, PR China;2. Department of Nephrology, State Discipline and State Key Laboratory of Kidney Disease (Chinese PLA General Hospital), Beijing 100853, PR China;3. Department of Nephrology, Beijing Tsinghua Changgeng Hospital, Beijing 102218, PR China;4. Dialysis Center, Civil Aviation General Hospital, Beijing 100123, PR China |