Randomization
Before randomization, all participants were given a unique trial identification number and received individual information on the proper use of the simulator and instrument handling by one of the three investigators (DT, TØ, or AV).The participants were then randomized to either the intervention group which practiced with 1–2 days between training sessions or the control group which practiced with 6–8 days between sessions.The randomization was done using an online web-based system, Sealed Envelope (London, United Kingdom). A 1:1 randomization with randomly permuted blocks was used. The allocation sequence was generated by computer using varying block sizes of four and six. This was kept concealed from the investigators throughout the trial. Participants were stratified according to sex (man/woman).