Updates are available Correction dated 2020-02-03
Click to view Correction: https://0-doi-org.brum.beds.ac.uk/10.1186/s12199-020-0843-3
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Article History
Received: 15 July 2019
Accepted: 9 December 2019
First Online: 26 December 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Jichi Medical University (approval no. 18-033). All students were given the opportunity to opt out of the study before it began.
: Not applicable
: The authors declare that they have no competing interests.
