About the Authors
National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai, People's Republic of China
Department of Public Health and Epidemiology, Swiss Tropical Institute, Basel, Switzerland
Ministry of Health of China, Beijing, People's Republic of China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: SL YZ ZC LYW XNZ. Performed the experiments: SL YZ HXL LH KY. Analyzed the data: SL KY. Contributed reagents/materials/analysis tools: SL YZ. Wrote the paper: SL PS JU XNZ.