1. Department of Histology and Embryology, School of Basic Medical Sciences, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
2. College of Acupuncture and Moxibustion, Hubei University of Chinese Medicine, Wuhan, Hubei 430065, P.R. China
3. Department of Pathogen Biology, School of Basic Medical Sciences, Hubei University of Chinese Medicine, Wuhan, Hubei 430065, P.R. China
4. Department of Anatomy, School of Basic Medical Sciences, Hubei University of Chinese Medicine, Wuhan, Hubei 430065, P.R. China