Received: 25 November 2019
Accepted: 12 March 2020
First Online: 15 April 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Institutional Review Board and the Ethics Committee of the Buddhist Dalin Tzuchi Hospital, Taiwan (IRB number: B10801009, approved on 2019/02/25). The requirement for patients’ informed consent was waived due to the retrospective study design.
: Not applicable.
: The authors declare that they have no competing interests.