Chao Lian1, Xue-Lei Li1, Xiao-Jun Liu2. 1. Department of Plastic and Reconstructive Surgery, Changzhi People's Hospital, Shanxi Medical University, Changzhi, Shanxi, People's Republic of China. 2. Department of Plastic and Reconstructive Surgery, Nanfang Hospital, 198153Southern Medical University, Guangzhou, Guangdong, People's Republic of China.