1. Department of Geriatrics, The First People’s Hospital of Lianyungang, The Affiliated Lianyungang Hospital of Xuzhou Medical University, The Affiliated Hospital of Kangda College of Nanjing Medical University, Lianyungang 222002, P.R. China
2. First Clinical College of Nanjing Medical University, Nanjing 210029, P.R. China
3. Department of Gastroenterology, First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, P.R. China
4. Department of Oncology, First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, P.R. China
5. Department of Radiation Oncology, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Cancer Hospital, Jiangsu Institute of Cancer Research, Xuanwu, Nanjing 210009, P.R. China