Towards an AI-based assessment model of surgical difficulty during early phase laparoscopic cholecystectomy. - Julian Ronald Abbing; Frank J. Voskens; Beerend G. A. Gerats; Ruby Mae Egging; Fausto Milletari; Ivo A. M. J. Broeders (Comput. methods Biomech. Biomed. Eng. Imaging Vis., 2023)