Laparoscopic right extended hepatectomy for perihilar cholangiocarcinoma: surgical technique - Conticchio, Maria; Tzedakis, Stylianos; Nassar, Alexandra; Ronde-Roupie, Charlotte; Peugeot, Louise; Berzan, Diana; Dhote, Alix; Fuks, David; Marchese, Ugo (Laparoscopic Surgery, 2025)