1. Key Laboratory of the State Ethnic Affairs Commission, Key Laboratory of Science and Technology Department (Jilin Province), Cancer Research Center, Yanbian University Medical College, Yanji 133002, P. R. China
2. Department of Internal Medicine of Yanbian University Hospital, Yanji 133000, P. R. China
3. Department of Image, Hongqi Hospital of Mudanjiang Medical University, Mudanjiang 157011, P. R. China
4. Institute of Military Veterinary Medicine, Academy of Military Medical Science, Changchun 130122, P. R. China