1. Department of Pharmacology, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa 252–5201, Japan
2. Department of Veterinary Public Health II, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa 252–5201, Japan
3. Department of Molecular Biology, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa 252–5201, Japan
4. Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, Suita, Osaka 565–0871, Japan
5. Department of Pediatric Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700–8556, Japan