Department of Plastic Surgery, Inha University School of Medicine, Incheon, Republic of Korea.

Address correspondence and reprint requests to Kun Hwang, MD, PhD, Department of Plastic Surgery, Inha University School of Medicine, 27 Inhang-ro, Jung-gu, Incheon, 22332, Republic of Korea; E-mail: [email protected]

Received 20 August, 2018

Accepted 7 December, 2018

This was supported by a grant from National Research Foundation of Korea (NRF-2019001834).

The author has no conflict of interest to declare.