Relationship between the risk of intestinal mucosal Epstein–Barr virus and/or cytomegalovirus infection and peripheral blood NK cells numbers in patients with ulcerative colitis: a cross-sectional study in Chinese population - Tian, Ye; Dai, Jinghua; Yang, Yunfeng; Guo, Xiaofeng; Wang, Wei; Li, Fengxia; Wang, Juzi; Liu, Ruiyun (Frontiers in Microbiology, 2024)