1. School of Public Health, Weifang Medical University, Weifang 261053, China
2. Weifang City Center for Disease Control and Prevention, Weifang 261061, China
3. National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai 200025, China
4. Key Laboratory of Parasite and Vector Biology, Ministry of Health, WHO Collaborating Center for Malaria, Schistosomiasis and Filariasis, Shanghai 200025, China