High-flow oxygen delivery system and oxygen reserve index-guided apnoeic oxygenation versus low-tidal-volume ventilation during robotic flexible ureteroscopy: A retrospective cohort study. - Saracoglu, Ayten; Arif, Mariah; Salah, Morshed; Abdullayev, Ruslan; Tallai, Bela; Ahmed, Haitham; Ibrahim, Ahmed M. I.; Al Ansari, Abdulla; Saracoglu, Kemal T. (Indian Journal of Anaesthesia, 2026)