Risk prediction models for lymph node metastasis in early gastric cancer patients: a systematic review and meta-analysis. - Duan, Meng; Li, Min; He, Lei; Dai, Shiming; Zhou, Lang; Liu, Zhiqun; Yang, Jie; Chen, Lingyuan; Liu, Xiang; Wu, Zhaoshu (BMC Gastroenterology, 2025)