Enteral immunonutrition versus enteral nutrition for patients undergoing esophagectomy: a randomized controlled trial - Li, Xiao-Kun; Cong, Zhuang-Zhuang; Wu, Wen-Jie; Xu, Yang; Zhou, Hai; Wang, Gao-Ming; Qiang, Yong; Luo, Li-Guo; Shen, Yi (Annals of Palliative Medicine, 2020)