1. Department of Laboratory Medicine, Qishan Hospital, Yantai, Shandong, China
2. Department of Microbiology Laboratory, Huangdao District Center for Disease Control and Prevention, Qingdao, Shandong, China
3. Health Center of Shuidao Town, Yantai, Shandong, China
4. Department of Laboratory Medicine, Yantaishan Hospital, Yantai, Shandong, China