1 Department of Plastic Surgery, The Second Hospital & Clinical Medical School, Lanzhou University, Lanzhou, Gansu, China.
2 Department of Plastic Surgery, The Second Hospital & Clinical Medical School, Lanzhou University, Lanzhou, Gansu, China. Electronic address: yonghongqin@163.com.
3 Department of Plastic Surgery, The Second Hospital & Clinical Medical School, Lanzhou University, Lanzhou, Gansu, China. Electronic address: zhang_xf@lzu.edu.cn.