Received: 10 April 2020
Accepted: 1 September 2020
First Online: 11 September 2020
Ethics approval and consent to participate
: This study was approved by our institutional review board (KMUHIRB-EXEMPT(I)-20180044) in Kaohsiung Medical University Chung-Ho Memorial Hospital, Taiwan.
: Not applicable.
: The authors declare that they have no competing interests.