1 Plastic Surgery Hospital (Institute), Peking Union Medical college, Chinese Academy of Medical Sciences, Shijingshan District No.33 Badachu Road, Beijing, China.
2 Plastic Surgery Hospital (Institute), Peking Union Medical college, Chinese Academy of Medical Sciences, Shijingshan District No.33 Badachu Road, Beijing, China. liuchunjun@psh.pumc.edu.cn.