1. Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand
2. College of Medicine and Public Health, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand
3. Department of Tropical Pathology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
4. Department of Medical Entomology, National Institute of Infectious Diseases, Tokyo 162 8640, Japan
5. Department of Entomology, Texas A&M University, TX 77845-2543, USA