The response rates were 48.3% (28 students) with plaster models, 82.5% (52 students) with silicone models, and 92.3% (60 students) with mannequins (Table 1), and the questionnaire results were shown in Additional file 2.Table 1Number of students and mean scores for the questionnaire itemsResponses/total (response rate)Mean scorePlaster model28/58 (48.3%)3.573Silicone model52/63 (82.5%)3.941Mannequin60/65 (92.3%)4.017