Text and Data Mining valid from 2019-11-16
Received: 12 September 2019
Accepted: 7 November 2019
First Online: 16 November 2019
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Changhua Christian Hospital institutional research committee (approved number 170710) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Not applicable
: All authors declare no conflict of interest in the study.