Text and Data Mining valid from 2018-10-16
Received: 24 April 2018
Accepted: 24 September 2018
First Online: 16 October 2018
Ethics approval and consent to participate
: All participants provided written informed consent according to the Declaration of Helsinki, and the study was approved by the ethics committee at Incheon Saint Mary’s Hospital (study number OC16OISI0138).
: 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.