Funding for this research was provided by:
Ministry of Health and Welfare (1720180)
Received: 3 April 2019
Accepted: 13 June 2019
First Online: 21 June 2019
Ethics approval and consent to participate
: This study was approved by the relevant Institutional Review Board (IRB no. 2019–03-129). Informed consent was waived due to the retrospective cohort study design.
: Not applicable.
: The authors declare that they have no competing interests.