1. Ministry of Education Key Laboratory of Child Development and Disorders, Pediatric Research Institute, Children's Hospital of Chongqing Medical University, Chongqing 400014, P.R. China
2. Clinical Laboratory, Shanxi Province People's Hospital, Taiyuan, Shanxi 030001, P.R. China
3. Cardiovascular Department (Internal Medicine), Children's Hospital of Chongqing Medical University, Chongqing 400014, P.R. China