Received: 16 July 2019
Accepted: 20 January 2020
First Online: 4 February 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Verbal consent was chosen to reduce research-related burden on participants in the model. The National Taiwan University Hospital Research Ethics Committee (approval number: 201901144RINB) approved the study.
: Not applicable.
: The authors declare that they have no competing interests.