Ha, Su Min
Chung, Yun Jae
Ahn, Hye Shin
Baek, Jung Hwan
Park, Sung Bin
Article History
Received: 21 January 2019
Accepted: 26 March 2019
First Online: 4 April 2019
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee (Chung-Ang University Hospital) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Our institutional review board (Chung-Ang University Hospital) approved this retrospective study, and the requirement for informed consent was waived.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.