Received: 19 July 2018
Accepted: 17 January 2019
First Online: 28 January 2019
Ethics approval and consent to participate
: This study was approved by the Human Research Committee (HRC) of China Medical University Hospital (DMR 97-IRB-055). Written informed consent was obtained from each participant for the first and second waves of data collection. The present study was also approved by HRC (CMUH105-REC1–026), the informed consent was not required because the study was a secondary data analysis.
: Not applicable.
: The authors declare that they have no competing interests.
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