1. Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease Prevention and Control, Beijing, People’s Republic of China
2. Department of Dermatology, Civil Aviation General Hospital, Beijing, People’s Republic of China
3. Beijing Fangshan District Center for Disease Prevention and Control, Beijing, People’s Republic of China
4. National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People’s Republic of China