1. School of Clinical Medicine, Weifang Medical University, Weifang, Shandong, P. R. China
2. School of Bioscience and Technology, Weifang Medical University, Weifang, Shandong, P. R. China
3. School of Public Health, Weifang Medical University, Weifang, Shandong, P. R. China
4. Weifang Medical University, Weifang, Shandong, P. R. China
5. School of Clinical Medicine, Shandong First Medical University, Tai-an, Shandong, P. R. China
6. Medical Laboratory Animal Center, Weifang Medical University, Weifang, Shandong, P. R. China
7. Department of Respiratory Medicine, Weifang People’s Hospital Weifang, Shandong, P. R. China