1. Department of Gastroenterology, Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, P.R. China
2. Department of Geriatrics and General Medicine, Third Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330008, P.R. China
3. Department of Oncology, Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health Sciences, Shanghai 201800, P.R. China