1. Nagasaki University Institute of Tropical Medicine (NEKKEN), Sakamoto 1-12-4, Nagasaki, Japan.
2. Program for Tropical Disease Research (PIET), School of Veterinary Medicine, National University of Costa Rica, P.O. Box 304-3000, Heredia, Costa Rica.
3. Department of Molecular Parasitology and Tropical Diseases, School of Medicine and Center of International Tropical Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.
4. Clodomiro Picado Institute, School of Microbiology, University of Costa Rica, P.O. Box 2060, San Jose, Costa Rica.