Department of Clinical Nutrition, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, China. Institute of Hepatopancreatobiliary Surgery, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038, China. Cancer Center of the First Hospital of Jilin University, Changchun, Jilin, 130021, China. Department of Medical Oncology, Fujian Cancer Hospital, Fujian Medical University Cancer Hospital, Fuzhou, Fujian, 350014, China. Department of Nutrition and Metabolism of Oncology, the First Affiliated Hospital of University of Science and Technology of China (Anhui Provincial Cancer Hospital), Hefei, Anhui, 230031, China. Center of Gastrointestinal Surgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, 510080, China. Department of Epidemiology, College of Public Health, Zhengzhou University, Zhengzhou, Henan, 450001, China. Department of Nutrition and Metabolism of Oncology, the First Affiliated Hospital of University of Science and Technology of China (Anhui Provincial Cancer Hospital), Hefei, Anhui, 230031, China. njlisuyi@sina.com. Department of Medical Oncology, Fujian Cancer Hospital, Fujian Medical University Cancer Hospital, Fuzhou, Fujian, 350014, China. gzq_005@126.com. Department of Gastrointestinal Surgery and Department of Clinical Nutrition, Beijing Shijitan Hospital, Capital Medical University, Beijing, 100038, China. shihp@ccmu.edu.cn. Department of Clinical Nutrition, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, China. hx_xu2015@163.com.