Favorable impact of a novel endoscopic auxiliary system (NEAS) on fluoroscopy‐guided lithotripsy for difficult bile duct stones: A pilot study. - Mao, Yu Qing; Ni, Jian Bo; Yu, Yi Neng; Peng, Kui; Qu, Ying; Xia, You Chen; Luo, Sheng Zheng; Fu, Seng Wang; Xie, Ni; Lu, Lun Gen; Wan, Xin Jian; Li, Bai Wen (Journal of Digestive Diseases, 2023)