1. Department of Preventive and Environmental Medicine, Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University
2. Kumamoto Kinoh Hospital
3. Ohta Atami Hospital
4. Hatsudai Rehabilitation Hospital
5. Ukai Rehabilitation Hospital
6. Morinomiya Hospital
7. Chikamori Rehabilitation Hospital
8. Department of Microbiology and Environmental Chemistry, School of Health Sciences, Kumamoto University