Text and Data Mining valid from 2020-03-12
Received: 3 May 2019
Accepted: 28 February 2020
First Online: 12 March 2020
Ethics approval and consent to participate
: The local ethics committee at Asan Medical Center approved the use of clinical data for this study (IRB No. 2011–000653). All study participants provided written informed consent prior to enrollment.
: Not applicable.
: The authors declare that they have no competing interests.