1. Department of Gastroenterology, Jiangbin Hospital of Guangxi Zhuang Autonomous Region, Nanning 530000, Guangxi, P.R. China
2. Department of Respiratory Oncology, Guangxi Medical University Cancer Hospital, Nanning 530021, Guangxi, P.R. China
3. Department of Radiation Oncology, Guangxi Medical University Cancer Hospital, Nanning 530021, Guangxi, P.R. China