1. Department of Basic Medical Sciences, Qinghai University, Xi'ning, China.
2. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'ning, China.
3. Department of Gastroenterology, the 7th Medical Center of Chinese PLA General Hospital, Beijing, China.
4. Department of Cancer Research Center, Beijing Tuberculosis and Thoracic Tumor Research Institute, Beijing Chest Hospital, Capital Medical University, Beijing, China.
5. Department of Gastrointestinal Tumor Surgery, the Affiliated Hospital of Qinghai University, Xi'ning, China.
6. Department of Internal Medicine, Qinghai People's Hospital, Xi'ning, China.