Article History
Received: 24 October 2018
Revised: 21 December 2018
Accepted: 22 January 2019
First Online: 20 February 2019
Compliance with ethical standards
:
: The scientific guarantor of this publication is Myeong-Jin Kim.
: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.
: Not applicable
: Written informed consent was not required.
: Institutional Review Board approval was not required for this review.
: • Illustrative Review