1. Jiangsu Provincial Center for Disease Prevention and Control, Key Laboratory of Enteric Pathogenic Microbiology, Ministry Health; Institute of Pathogenic Microbiology; Nanjing Jiangsu Province P. R. China
2. Jiangsu Key Laboratory of Molecular Nuclear Medicine; Jiangsu Institute of Nuclear Medicine; Wuxi Jiangsu Province P. R. China
3. Mathematics School; Jilin University; Changchun Jilin Province P. R. China