Hong, K. D.
Kim, J.
Ji, W.
Wexner, S. D.
Article History
Received: 23 January 2019
Accepted: 1 April 2019
First Online: 22 April 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: As this was a systematic review and meta-analysis of published available studies, ethical approval was not required.
: For this type of review article, formal informed consent is not required.