Article History
Received: 6 December 2019
Accepted: 7 February 2020
First Online: 15 February 2020
Ethics approval and consent to participate
: Our study protocol was approved by the Institutional Review Board of the Mackay Memorial Hospital, Taipei, Taiwan. This study was a retrospective analysis of prospectively collected data and, therefore, informed consent from patients was not required.
: yes
: The authors declare that there is no conflict of interest for this work.