1. Department of Biomedical Research Center, Binzhou Medical University, Yantai, Shandong 264000, P.R. China
2. Department of Histology and Embryology, Binzhou Medical University, Yantai, Shandong 264000, P.R. China
3. Department of Cardiology, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong 264000, P.R. China
4. Department of Medical Affairs, Affiliated Hospital of Binzhou Medical College, Binzhou, Shandong 256603, P.R. China