About the Authors

Xiaoyan Gao, Guodong Liang
State Key Laboratory for Infectious Disease Control and Prevention, Institute for Viral Disease Control and Prevention, Chinese Center for Diseases Control and Prevention, Beijing, China

Roger Nasci
Centers for Disease Control and Prevention, Fort Collins, Colorado, United States of America

Corresponding Author

gdliang@hotmail.com

Competing Interests

The authors have declared that no competing interests exist.