1. Department of Gastroenterology, The Central Hospital of Hengyang City, Hengyang, Hunan, China
2. Department of Medical Oncology, The Central Hospital of Hengyang City, Hengyang, Hunan, China
3. Department of General Surgery, The Central Hospital of Hengyang City, Hengyang, Hunan, China
4. Department of Neuroscience, The Affiliated Nanhua Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan, China