Funding for this research was provided by:
China Medical University, Taiwan (DMR-108-112)
Received: 23 May 2019
Accepted: 6 May 2020
First Online: 15 May 2020
Ethics approval and consent to participate
: This study used anonymized secondary data retrieved from the National Health Interview and Survey and the National Health Insurance Research Database. The informed consent was waived by the ethics committee because of encrypted identification number. This study has been approved by the research ethics committee at China Medical University (IRB: CMUH106-REC3–080) Taiwan.
: Not applicable.
: The authors declare that they have no competing interests.