Challenges in multi-centric generalization: phase and step recognition in Roux-en-Y gastric bypass surgery. - Joël L. Lavanchy; Sanat Ramesh; Diego Dall'Alba; Cristians Gonzalez; Paolo Fiorini; Beat P. Müller-Stich; Philipp C. Nett; Jacques Marescaux; Didier Mutter; Nicolas Padoy (Int. J. Comput. Assist. Radiol. Surg., 2024)