1Laboratory of Anatomy, Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan
2Laboratory of Veterinary Internal Medicine, Department of Veterinary Clinical Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan
3Department of Endocrinology, Metabolism and Nephrology, Kochi Medical School, Kochi University, Nankoku, Japan
4Section of Biological Safety Research, Chitose Laboratory, Japan Food Research Laboratories, Chitose, Japan
5Veterinary Teaching Hospital, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan
6Organization for Promotion of Tenure Track, University of Miyazaki, Miyazaki, Japan
7Matsubara Animal Hospital, Matsubara, Japan
8Department of Histology and Cytology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
Approved by: Frontiers in Veterinary Science, Frontiers Media SA, Switzerland
✉*Correspondence: Osamu Ichii ichi-o@vetmed.hokudai.ac.jp
This article was submitted to Veterinary Experimental and Diagnostic Pathology, a section of the journal Frontiers in Veterinary Science
Copyright © 2019 Ichii, Ohta, Horino, Nakamura, Hosotani, Mizoguchi, Morishita, Nakamura, Sasaki, Takiguchi, Sato, Oyamada, Elewa and Kon.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.