1. Department of Nephrology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing Key Laboratory of Pediatric Chronic Kidney Disease and Blood Purification, Key Laboratory of Major Diseases in Children, Ministry of Education, Beijing 100045, P.R. China
2. Pediatric Department, Shunyi Women's and Children's Hospital of Beijing Children's Hospital, Beijing 101300, P.R. China