1. Department of Medical Affairs of The Affiliated Hospital of Qingdao University, No. 1677 Wutaishan Road, Qingdao, 266000, China
2. Department of Pathogenic Biology, Qingdao University Medical College, 308 Ningxia Road, Qingdao, 266021, China
3. Department of Special Examination, Qingdao Women & Children Hospital, Qingdao, 266035, China