Combining the systemic inflammation response index and prognostic nutritional index to predict the prognosis of locally advanced elderly esophageal squamous cell carcinoma patients undergoing definitive radiotherapy - Yan, Ke; Wei, Wanyi; Shen, Wenbin; Du, Xingyu; Zhu, Shuchai; Zhao, Hanjun; Wang, Xiaobin; Yang, Jie; Zhang, Xueyuan; Deng, Wenzhao (Journal of Gastrointestinal Oncology; Vol 13, No 1 (February 28, 2022): Journal of Gastrointestinal Oncology, 2021)