Early cholangioscopy-assisted electrohydraulic lithotripsy in difficult biliary stones is cost-effective. - Alrajhi, Saad; Barkun, Alan; Adam, Viviane; Callichurn, Kashi; Martel, Myriam; Brewer, Olaya; Khashab, Mouen A.; Forbes, Nauzer; Almadi, Majid A.; Chen, Yen-I (Therapeutic advances in gastroenterology, 2021)