1. 1 Department of Virology, School of Public Health, Shandong University, Jinan 250012, PR China
2. 2 Department of Laboratory Medicine, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan 250014, PR China
3. 3 State Key Laboratory of Microbial Technology, National Glycoengineering Research Center, Shandong University, Jinan 250100, PR China
4. 4 The Key Laboratory for Experimental Teratology of the Ministry of Education, Shandong University, Jinan 250012, PR China