Endostrat: a multicenter study of AI-assisted two-level risk stratification for gastric precancerous and early neoplastic lesion screening - Zian Chen; Huihui Ma; Chenxi Yang; Hongwei Hao; Qian Gu; Luwei Jia; Zhixu Lu; Ruoying Ding; Renzhong Li; Linghui Song; Zhijie Feng (Frontiers in Medicine, 2026)