Pu Wang1, Luosha Gu2, Zelian Qin3. 1. Department of Plastic and Reconstructive Surgery, Peking University Third Hospital, Beijing, 100191, People's Republic of China. 2. Department of Plastic Surgery, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, People's Republic of China. 3. Department of Plastic and Reconstructive Surgery, Peking University Third Hospital, Beijing, 100191, People's Republic of China. qinzl@bjmu.edu.cn.