1. Laboratory of Anatomy, Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Hokkaido 060-0818, Japan
2. Department of Surgery and Theriogenology, Faculty of Animal Science and Veterinary Medicine, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh
3. Laboratory of Agrobiomedical Science, Faculty of Agriculture, Hokkaido University, Hokkaido 060-0818, Japan
4. Section of Biological Safety Research, Chitose Laboratory, Japan Food Research Laboratories, Hokkaido 060-0818, Japan
5. Medical Zoology Group, Dept. of Infectious Diseases, Hokkaido Institute of Public Health, Hokkaido 060-0818, Japan
6. Department of Anatomy, Histology and Physiology, Faculty of Animal Science and Veterinary Medicine, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh
7. Laboratory of Anatomy, School of Veterinary Medicine, Rakuno Gakuen University, Hokkaido 060-0818, Japan
8. Department of Histology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44519, Egypt