Chao Lian1, Hai-Li Liu1, Xue-Lei Li2, Jun-Zhe Zhang3, Yan-Ran Li4, Xiao-Jun Liu5. 1. Department of Plastic and Reconstructive Surgery, Changzhi People's Hospital, Shanxi Medical University, Changzhi, Shanxi, PR China. 2. Department of Plastic and Reconstructive Surgery, Changzhi People's Hospital, Shanxi Medical University, Changzhi, Shanxi, PR China. Electronic address: czsrmyylxl@126.com. 3. Department of Orthopedic Surgery, the Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, PR China. 4. Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, PR China. 5. Department of Plastic and Reconstructive Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, PR China. Electronic address: lxjun_ok@126.com.