Received: 16 November 2020
Accepted: 8 February 2021
First Online: 25 February 2021
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Kaohsiung Medical University Hospital (KMUHIRB-EXEMPT (II)-20160028). All methods were carried out in accordance with relevant guidelines and regulations. As study participants were collected from the NHIRD, the requirement of patient consent was waived due to the anonymity of the database.
: Not applicable.
: None of the authors have any conflicts of interest.