Results
We included a total of 39 participants, of which 35 participants completed both the intervention and the retention test. Participant baseline characteristics are presented in Table Baseline characteristics for participants who completed the interventionTrial flowchart according to the CONSORT flow diagram [The mean time to proficiency was 291 min (95% CI [113;469], SD 89) and 299 min (95% CI [121;477], SD 89), respectively, for the intervention and control group (Intervalplot showing time to proficiency during the intervention and the retention testBoth groups reached proficiency significantly faster at the retention test compared to the initial training (There was no difference in the need for instructor-based feedback between the groups during the intervention. They used, respectively, 288 (IQR 76–467) and 236 (IQR 12–450) seconds in the intervention and control group (