Text and Data Mining valid from 2018-06-19
Received: 24 July 2017
Accepted: 14 June 2018
First Online: 19 June 2018
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board of Uijeongbu St. Mary’s Hospital (IRB policy No. UC15RISI0035). Since this study is a retrospective chart review study the need for written consent was formally waved by the IRB of Uijeongbu St. Mary’s Hospital.
: Not applicable
: The authors declare that they have no competing interests.
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