Article History
Received: 13 February 2018
Accepted: 1 October 2018
First Online: 17 October 2018
Ethics approval and consent to participate
: This study was approved by the Sungkyunkwan University School of Medicine Clinical Research Ethics Board (SMC 2017–05–084-001). All participants were informed and agreed to join this study. The written consents were obtained from all participants.
: Participants agreed and signed the consent for publication of all images and data gathering during the study.
: The authors declare that they have no competing interests
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.