Received: 9 September 2018
Accepted: 28 October 2019
First Online: 6 November 2019
Ethics approval and consent to participate
: This study was approved by the Korea Institute of Drug Safety & Risk Management Institutional Review Board (IRB No. 2014–1). Written informed consent for the use of anonymized data for scientific purposes was obtained from all responders in the study.
: Not applicable
: The authors declare that they have no competing interests.