Son, Gyung Mo
Kim, Seong-Jang
Article History
First Online: 21 August 2018
Compliance with ethical standards
:
: 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.
: Institutional review board approval was not required because we only performed data analysis based on the published studies.
: Written informed consent was not required for this study because it is a meta-analysis based on the studies that have been published.