1. Department of Pediatrics, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang Uygur Autonomous Region 830054, P.R. China
2. Department of Pediatrics, The First People's Hospital of Kashi, Kashi, Xinjiang Uygur Autonomous Region 844000, P.R. China
3. Department of Pediatrics, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang Uygur Autonomous Region 830054, P.R. China