1. Central Laboratory, Affiliated Hospital, Qingdao University, Qingdao 266003, P.R. China
2. Department of Nephrology, Affiliated Hospital, Qingdao University, Qingdao 266003, P.R. China
3. Pediatrics, Affiliated Hospital, Qingdao University, Qingdao 266003, P.R. China
4. Department of Nephrology, Qingdao Women and Children's Hospital, Qingdao University, Qingdao 266011, P.R. China
5. Department of Nephrology, Qingdao Branch of Qilu Hospital of Shandong University, Qingdao, Shandong 266000, P.R. China