Early operative difficulty assessment in laparoscopic cholecystectomy via snapshot-centric video analysis. - Saurav Sharma; Maria Vannucci; Leonardo Pestana Legori; Mario Scaglia; Giovanni Guglielmo Laracca; Didier Mutter; Sergio Alfieri; Pietro Mascagni; Nicolas Padoy (Int. J. Comput. Assist. Radiol. Surg., 2025)