Creatinine-to-cystatin C ratio as a marker of skeletal muscle mass for predicting postoperative complications in patients undergoing gastric cancer surgery - Gao, Jiaqi; Liang, Huiping; Qian, Yun; Pan, Junhai; Liu, Wei; Qi, Weilin; Zhou, Wei; Ge, Xiaolong; Wang, Xianfa (Annals of Palliative Medicine, 2021)