1. Department of Epilepsy Center, Ji Nan Children's Hospital, Jinan, Shandong 250022, P.R. China
2. Department of Clinical Laboratory, Qingdao Third People's Hospital, Qingdao, Shandong 266041, P.R. China
3. Department of Pathogen Biology, School of Basic Medical Sciences, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong 250062, P.R. China