1. Institute of Parasitic Diseases, 11445 E. Via Linda 2-419, Scottsdale, Arizona 85259.
2. Department of Biology, Brigham Young University, 1114 MLBM, Provo, Utah 84602.
3. Department of Parasitology, Institute of Ecology and Biological Resources (IEBR), Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.