Author contributions
X.C. managed this project generally. X.C. and Y.S. conceptualized and designed this study as well as acquired funding. Y.S. and Y.M. conducted a literature search and prepared the movie clips. All authors participated in the enrollment, collection of data and evaluations. Y.M. and G.H. were responsible for administering the questionnaire and exam, and for checking the quality of the collected data. X.C., Y.S., Y.H. performed the statistical analysis. Y.S. and X.C. wrote the first draft of the manuscript, and all authors participated in and approved the final manuscript.