1. Department of Burn and Plastic Surgery, Affiliated Hospital of Chengde Medical University, South Wing Hospital of Chengde Medical College, Chengde, Hebei 067000, P.R. China
2. Department of Burn and Plastic Surgery, Bayingol Mongolia Autonomous Prefecture People's Hospital, Urumqi, Xinjiang Uyghur Autonomous Region 841000, P.R. China
3. Department of General Surgery, Bayingol Mongolia Autonomous Prefecture People's Hospital, Urumqi, Xinjiang Uyghur Autonomous Region 841000, P.R. China