Funding for this research was provided by:
Food and Drug Administration (105TFDA-N-005)
Accepted: 2 October 2020
First Online: 12 October 2020
Ethics approval and consent to participate
: The Institutional Review Board (IRB) of National Taiwan Normal University approved this study (No. 201606HM002). Written consent from the study participants was waived because the data were collected from a population-based database of de-identified secondary data.
: Not applicable.
: The authors declare that they have no competing interests.