1. Department of Paediatrics, The Affiliated Yangpu Hospital of Shanghai Tongji University, Shanghai 200090, P.R. China
2. Department of Paediatrics, The First Affiliated Hospital of Xinjiang Medical University, Xinjiang, Uygur Autonomous Region 830054, P.R. China
3. Department of Paediatrics, Xinjiang Medical University, Xinjiang, Uygur Autonomous Region 830011, P.R. China
4. Department of Paediatrics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China