1. Department of Burn and Plastic Surgery, General Hospital of Ningxia Medical University, Yinchuan, Gansu 750001, P.R. China
2. Department of Plastic Surgery, Qingyang People's Hospital of Gansu Province, Qingyang, Gansu 745000, P.R. China
3. Department of Traumatic Orthopaedics, General Hospital of Ningxia Medical University, Yinchuan, Gansu 750001, P.R. China