Article History
Received: 20 March 2020
Accepted: 29 May 2020
First Online: 12 June 2020
Compliance with Ethical Standards
:
: The authors declare that they have no competing interests.
: Written informed consent was obtained from all patients and residents participating in the study, as approved by the ethics committee of our hospital.
: Written informed consent for publication was obtained from all patients and residents participating in the study.