Holographic Augmented Reality Versus Screen Visualisation of 3D Rendering Models for the Pre-operative Evaluation and Planning of Liver Resections

The goal of this trial is to compare the evaluation of 3D liver models visualised as holograms with HoloLens 2 and on digital PDF files in HPB surgical trainees. The main questions it aims to answer are: * Do the holographic models allow a superior accuracy in terms of anatomical evaluation and surgical planning? * Is there any difference in terms of time consumed and Task Load Index? Participants will analyse cases through both modalities and answer a questionnaire.