The impact of adjuvant therapy on survival for node-negative esophageal squamous cell carcinoma: a propensity score-matched analysis - Deng, Xuyang; He, Wenwu; Jiang, Yingchun; Deng, Sijie; Mao, Tianqin; Leng, Xuefeng; Luo, Qiyu; Zheng, Kai; Han, Yongtao (Annals of Translational Medicine, 2021)