1. Shandong Center for Disease Control and Prevention, Jinan, People’s Republic of China
2. Shandong Institute for Food and Drug Control, Jinan, People’s Republic of China
3. Shandong Public Health Clinical Center Affiliated to Shandong University, Jinan, People’s Republic of China
4. Weifang People's Hospital, Weifang, People’s Republic of China
5. State Key Laboratory for Diagnosis and Treatment of Infectious Disease, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, People’s Republic of China