1. Department of Social Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
2. IRCCS Giannina Gaslini, Genova, Italy
3. Meijo University, Nagoya, Japan
4. Mizoguchi Hospital, Shizuoka, Japan
5. Hirosaki University, Hirosaki, Japan
6. Aomori University of Health and Welfare, Aomori, Japan
7. Department of Oral Health Care, Hirosaki University Graduate School of Medicine, Hirosaki, Japan