Article History
Received: 2 April 2020
Revised: 11 June 2020
Accepted: 15 June 2020
First Online: 29 June 2020
Compliance with ethical standards
: The study was conducted in accordance with the Helsinki Declaration and approved by the Institutional Review Board of St. Vincent’s Hospital, the Catholic University of Korea (No. VC20RISI0068).
: The authors declare that there are no conflicts of interest.