1 Department of Plastic and Reconstructive Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 33 Ba-Da-Chu Road, Beijing, 100144, People's Republic of China.
2 Department of Plastic and Reconstructive Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 33 Ba-Da-Chu Road, Beijing, 100144, People's Republic of China. chenboys@hotmail.com.