From the Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

Received June 8, 2019, and accepted for publication, after revision July 7, 2019.

Conflicts of interest and sources of funding: none declared.

Reprints: Qingfeng Li, MD, PhD, Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, 639 Zhizaoju Rd, Shanghai, China. E-mail: dr_liqingfeng@126.com.

Online date: November 4, 2019