Ahn, Sung Gwe
Cha, Yoon Jin
Bae, Soon June
Yoon, Chanik
Lee, Hak Woo
Jeong, Joon http://orcid.org/0000-0003-0397-0005
Funding for this research was provided by:
National Research Foundation of Korea (2015R1C1A1A02037104)
Ministry of Health and Welfare (1520120)
Article History
Received: 20 October 2017
Accepted: 15 March 2018
First Online: 24 March 2018
Ethics approval and consent to participate
: The study protocol was reviewed and approved by the Institutional Review Boards of he Gangnam Severance Hospital, Yonsei University, Seoul, Korea, and adhered to the tenets of the Declaration of Helsinki. Owing to retrospective approach of this study, the need for informed consent was waived by the ethics committees.
: Not applicable.
: The authors declare that they have no competing interest.
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