1. Jia Musi Hospital of Traditional Chinese Medicine, Jia Musi, Hei Longjiang, China
2. Department of Gastroenterology, The First Affiliated Hospital of Harbin Medical University, Harbin, Hei Longjiang, China
3. Department of Surgical Oncology, Jia Musi Central Hospital, Jia Musi, Hei Longjiang, China