1. College of life Science and Technology, Harbin Normal University, Harbin, China
2. Department of Gastroenterology, Heilongjiang Red Cross (General Forest Industry) Hospital, Harbin, China
3. Department of General Medicine, People’s Hospital of Dongfanghong Forestry Bureau, Fuzhou, China
4. Department of Pediatrics, Heilongjiang Red Cross (General Forest Industry) Hospital, Harbin, China