1 Department of Plastic Surgery, Lanzhou University Second Hospital, Lanzhou, Gansu, People's Republic of China.
2 Department of Plastic and Aesthetic Surgery, Affiliated Changzhi People's Hospital of Changzhi Medical College, Changzhi, Shanxi, People's Republic of China.
3 Department of Plastic and Aesthetic Surgery, Nanfang Hospital of Southern Medical University, Guangzhou, Guangdong, People's Republic of China.