1. Department of Parasitology, Shandong University School of Basic Medicine, Jinan, P.R. China.
2. Longyan University & Fujian Provincial Key Laboratory for the Prevention and Control of Animal Infectious Diseases and Biotechnology, Longyan, P.R. China.
3. College of Marine Science, Shandong University at Weihai, Weihai, P.R. China.