1. Department of Biotechnology, College of Bioengineering, Henan University of Technology, Zhengzhou, Henan 450001, P.R. China
2. Laboratory of Morphology, College of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
3. Department of Infectious Diseases, The Xiang'an Hospital of Xiamen University, Xiamen, Fujian 361005, P.R. China