Sleeve gastrectomy versus Roux-en-Y-gastric bypass in patients with body mass index over 50 kg/m2: international multicentre cohort. - Kollmann L; Rosenblum I; Poljo A; Probst P; Muller MK; Kalinowski P; Dalkılıç MS; Şişik A; Betzler J; Otto M; Taha-Mehlitz S; Müller BP; et al. (BJS open, 2025)