Funding for this research was provided by:
Research Support Program to Apply the Wisdom of the University to tackle COVID-19 Related Emergency Problems
Received: 5 March 2021
Accepted: 22 October 2021
First Online: 4 November 2021
: This research was approved by the research ethics committee of the University of Tsukuba, Japan. Informed consent was obtained from all patients for being included in the study. We explained to participants on the top page of the questionnaire that the data would be published online, and obtained their consent.
: Not applicable.
: The authors declare they have no actual or potential competing financial interests.