1. Department of Immunology, College of Basic Medicine, Binzhou Medical University, Yantai, Shandong 2640032, P.R. China
2. Department of Laboratory Medicine, Zhangqiu People's Hospital, Jinan, Shandong 250200, P.R. China
3. Department of Laboratory Medicine, Lixia People's Hospital, Jinan, Shandong 250013, P.R. China
4. Department of Laboratory Medicine, Zibo First Hospital, Zibo, Shandong 255200, P.R. China
5. Department of Immunology, Shandong Yinfeng Academy of Life Science, Jinan, Shandong 250013, P.R. China