1. Laboratory of Small Animal Surgery, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
2. Teikyo University Hospital Mizonokuchi, Kanagawa, Japan
3. Department of Clinical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC, Canada
4. Department of Cardiovascular Surgery, School of Medicine, Teikyo University, Tokyo, Japan
5. Department of Biostatistics, School of Medicine, Yokohama City University, Yokohama, Japan