Article History
Received: 16 March 2019
Revised: 13 June 2019
Accepted: 18 July 2019
First Online: 15 August 2019
Compliance with ethical standards
:
: The scientific guarantor of this publication is Seong Jong Yun, MD, PhD.
: 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.
: One of the authors (Seong Jong Yun, MD) has significant statistical expertise.
: Written informed consent was not required for this study because the nature of our study was a systemic review and meta-analysis.
: Institutional Review Board approval was not required because the nature of our study was a systemic review and meta-analysis.
: • Meta-analysis performed at one institution