1. Department of Clinical Laboratory, The Affiliated Hospital of Binzhou Medical University, Binzhou, Shandong 256600, P.R. China
2. Department of Clinical Laboratory, China‑Japan Friendship Hospital, Beijing 100029, P.R. China
3. Key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, P.R. China