Questionnaire
We inquired how the participants felt about the usefulness of the setup (Table 
Questionnaire about usefulness of the setup ‘Underwater’ in learning ultrasound skillsBad 0 (0)Moderate 2 (7.4)Sufficient 12 (44.4)Good 13 (48.1)Bad 0 (0)Moderate 7 (25.9)Sufficient 8 (29.6)Good 12 (44.4)Yes 12 (44.4)No 12 (44.4)No opinion 3 (11.1)Yes 26 (96.3.)No 0 (0)No opinion 1 (3.7)Yes 25 (92.6)No 2 (7.4)No opinion 0 (0)No fun 0 (0)little fun 1 (3.7)fun 8 (29.6)very fun 18 (66.7)Little 1 (3.7)Moderate 3 (11.1)Much 16 (59.3)Very much 7 (25.9)- Before practical training- Beside practical training, for novices- Beside practical training for advanced learnersYes 17 (63.0) / No 10 (37.0)Yes 19 (70.4) / No 8 (29.6)Yes 0 (0%) / No 27 (100.0)The majority of the participants indicated that the setup is useful for training eye-hand coordination and probe holding stability, as well as for learning and simulating probe handling. Moreover, most participants enjoyed playing the game and felt that it improved their ultrasound skills. They indicated that the optimal moment to play the serious game is before or during the practical sessions. None of the participants was of the opinion that the current setup is useful for advanced ultrasound learners.