Trial design
We performed a randomized controlled trial with two parallel training groups; one group received an educational video and robotic simulation training (video group), while the other received simulation training alone (control group). The study protocol was approved by the institutional ethics committee of (No: 2108–017) and was registered at the University Hospital Medical Information Network (No: UMIN000045495). The Consolidated Standards of Reporting Trials (CONSORT) guidelines were followed [