1. Department of Histology and Embryology, School of Basic Medical Sciences, Xi’an Jiaotong University, Xi’an 710061, China
2. Department of Pathogenic Microbiology and Immunology, School of Basic Medical Sciences, Xi’an Jiaotong University, Xi’an 710061, China
3. The First Affiliated Hospital of Harbin Medical University, Harbin Medical University, Harbin 150006, China