Mass Casualty Incident Training in Immersive Virtual Reality: Quasi-Experimental Evaluation of Multimethod Performance Indicators - Anke Sabine Baetzner; Yannick Hill; Benjamin Roszipal; Solène Gerwann; Matthias Beutel; Tanja Birrenbach; Markus Karlseder; Stefan Mohr; Gabriel Alexander Salg; Helmut Schrom-Feiertag; Marie Ottilie Frenkel; Cornelia Wrzus (Journal of Medical Internet Research)