1. Department of Parasitology, Institute for Tropical Medicine, Nagasaki University, Nagasaki, Japan
2. Department of Human Ecology, University of Occupational and Environmental Health, Kitakyushu, Japan
3. Servicio Nacional de Erradicacion de la Malaria, Ministerio de Salud Publica, Guatemala
4. Department of Parasitic Diseases, Kumamoto University School of Medicine, Kumamoto, Japan