Diagnostic performance of white light endoscopy, narrow band imaging, and flexible spectral imaging color enhancement for early gastric cancer: a systematic review and meta-analysis - Liu, Zhimei; Ji, Junjie; Yang, Qingya; Pang, Fei; Qiu, Yue (Quantitative Imaging in Medicine and Surgery; Vol 15, No 6 (June 06, 2025): Quantitative Imaging in Medicine and Surgery, 2025)