1. Apple Tree Animal Hospital, 52‐2 Hiruta, Takatanacho Anjo‐shi Aichi 446‐0053 Japan
2. Laboratory of Veterinary Surgery, Joint Department of Veterinary Medicine, Faculty of Applied Biological Sciences Gifu University, 1‐1 Yanagido, Gifu‐shi Gifu 501‐1193 Japan
3. Division of Digestive Surgery, Department of Surgery Nihon University School of Medicine, 1‐6 Kandasurugadai, Chiyoda‐ku Tokyo 101‐8309 Japan
4. Aya Animal Hospital, 4‐1‐17 Fujinokidai, Nara‐shi Nara 631‐0044 Japan
5. Animal Medical Center ALOHA, 5‐12‐5, Hikinocho, Fukuyama‐shi Hiroshima 721‐0942 Japan
6. Kanai Veterinary Surgery, 569‐1 Nozato Himeji‐shi Hyogo 670‐0811 Japan