1. University of California, Berkeley, CA 94720, USA
2. George Washington University, Washington, DC 20037, USA
3. Institute of Parasitic Disease, Sichuan Center for Disease Control and Prevention, Chengdu, Sichuan 610041, China
4. National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai
5. The Ohio State University, Columbus, OH 43212, USA