1. State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases, Xijing Hospital, Air Force Medical University, Xi’an, Shaanxi 710032, China
2. Department of Gastroenterology, Chinese Armed Police Force Fujian Armed Police Corps Hospital, Fuzhou, Fujian 350001, China
3. Department of Clinical Nutrition, Xijing Hospital, Air Force Medical University, Xi’an, Shaanxi 710032, China
4. Department of Radiation Protective Medicine, Air Force Medical University, Xi’an, Shaanxi 710032, China