1. Department of Orthopedics, Hangzhou Children's Hospital, Hangzhou, Zhejiang 310014, P.R. China
2. Department of Orthopedics, The First People's Hospital of Huzhou, Huzhou, Zhejiang 313000, P.R. China
3. Emergency Department, The First People's Hospital of Huzhou, Huzhou, Zhejiang 313000, P.R. China