1. Department of Radiotherapy and Chemotherapy, First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang, China (mainland)
2. Department of Anus and Intestine Surgery, First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang, China (mainland)
3. Department of General Surgery, First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang, China (mainland)
4. Department of Anus and Intestine Surgery, Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang, China (mainland)