Received: 6 February 2020
Accepted: 29 May 2020
First Online: 22 June 2020
Ethics approval and consent to participate
: The study was conducted according to the Declaration of Helsinki. The research protocol was approved by the Institutional Review Board (IRB) of Chonbuk National University Hospital. All participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.