1. Department of Gastroenterology, The Affiliated Clinical College of Xuzhou Medical University, Xuzhou 221002, China
2. Department of Oncology, Zhongda Hospital, Southeast University, Nanjing 210009, China
3. Department of Scientific Research, Shaanxi Academy of Social Sciences, Xi’an 710061, China
4. Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Tongji University, Shanghai 200092, China
5. Department of Gastroenterology, The Affiliated Xuzhou Municipal Hospital of Xuzhou Medical University, Xuzhou 221002, China