1 Department of Histology and Embryology, Hebei Medical University, Shijiazhuang, 050017, China.
2 Department of Occupational and Environmental Health, Hebei Province Key Laboratory of Environment and Human Health, Hebei Medical University, Shijiazhuang, 050017, China.
3 Department of Histology and Embryology, School of Basic Medical Sciences, North China University of Science and Technology, 063210, Hebei Province, China.
4 Department of human anatomy, Hebei Medical University, Shijiazhuang, 050017, China.
5 Department of Histology and Embryology, Hebei Medical University, Shijiazhuang, 050017, China. xiujunzhao1977@126.com.
6 Department of cell biology, Hebei Medical University, Shijiazhuang, 050017, China. lvpinzy@163.com.