Study design and setting
This double-blind cross-over study was conducted at an academic medical centre between April 2018 to March 2019 and was implemented as a part of medical student training in the emergency department (ED). The study protocol was approved by the Institutional Ethical Review Board of the University of Fukui Hospital (20,190,019). All study methods adhered to the Declaration of Helsinki and the Consolidated Standards of Reporting Trials Statement.