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Authors
Youn, YoungAh
Seo, Yu-mi
Yum, Sook-Kyung
Sung, In Kyung
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Article History
Received: 18 March 2019
Accepted: 6 August 2019
First Online: 23 August 2019
Ethics approval and consent to participate
: For this type of retrospective study formal consent is not required; any personal data was protected. The ethical approval was obtained from the Catholic University of Korea, Seoul St. Mary’s Hospital, Institutional Review Board.
: Non applicable.
: The authors declare that they have no competing interests.
