Article History
Received: 11 November 2018
Revised: 1 April 2019
Accepted: 8 April 2019
First Online: 2 May 2019
Compliance with ethical standards
: The study was carried out in accordance with the Helsinki Declaration and approved by the Institutional Review Board of St. Vincent’s Hospital, the Catholic University of Korea (No. VC18RESI0136)
: The authors declare that there are no conflicts of interest.