Text and Data Mining valid from 2018-09-10
Received: 26 March 2018
Accepted: 20 August 2018
First Online: 10 September 2018
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of Seoul St. Mary’s Hospital (KC18RESI0142). The study was a secondary data analysis and did not involve contact with individual patients so consent to participate was not applicable.
: Not applicable.
: The authors declare that they have no competing interest.
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