1. Department of Anatomy and Cell Biology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
2. Department of Animal Science and Biotechnology, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5201, Japan
3. The Life Museum of Azabu University, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5201, Japan
4. Eco-plan, 1-14-13 Takasu, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0146, Japan
5. NPO Institute for Biodiversity Research and Education “Earthworm”, 1549-3-1 Oiwake, Karuizawa, Nagano, Japan
6. Department of Environmental Bioscience, School of Veterinary Medicine, Kitasato University, 23-35-1 Higashi, Towada, Aomori 034-8628, Japan
7. Department of Humanities and Sciences, Musashino Art University, 1-736 Ogawa-cho, Kodaira, Tokyo 187-8505, Japan