1. Department of Parasitology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
2. Human-Life Research Division, Mitsubishi Research Institute Inc., 2-10-3 Nagatacho, Chiyoda-ku, Tokyo 100-8141, Japan
3. MRI Research Associates Inc., 1-13-1 Uchikanda, Chiyoda-ku, Tokyo 101-0047, Japan
4. Platinum Society Center, Mitsubishi Research Institute Inc., 2-10-3 Nagatacho, Chiyoda-ku, Tokyo 100-8141, Japan