Received: 11 July 2019
Accepted: 26 February 2020
First Online: 16 March 2020
Ethics approval and consent to participate
: The protocol and consent forms of the study were reviewed and approved by the National Taiwan University Hospital Research Ethics Committee (NTUH-REC No.:200805047R). Before participating in the study, all workers and patients received written and oral information regarding the study procedures and potential adverse effects, and signed informed and published consent forms.
: Not applicable.
: The authors declare that they have no competing interests.