The efficacy of neoadjuvant immunotherapy in gastric cancer, adenocarcinoma of the esophagogastric junction, and esophageal cancer: a meta-analysis - Qian, Mengyi; Fang, Yingying; Xiang, Zhiyi; Zhang, Yueming; Zhan, Hujie; Chen, Xiaotong; Chen, Yihang; Xu, Tinghui (Frontiers in Oncology, 2024)