1. Department of Public Health Medicine, Bielefeld University School of Public Health, Bielefeld, Germany.
2. Department of Public Health, Sapporo Medical University School of Medicine, Sapporo, Japan.
3. Department of Public Health, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan.
4. Department of Preventive Medicine and Community Health, University of Occupational and Environmental Health, Kitakyushu, Japan.
5. National Institute of Health and Nutrition, Tokyo, Japan.
6. Department of Nursing, Nagoya University School of Health Sciences, Nagoya, Japan.
7. Department of Public Health, Hokkaido University Graduate School of Medicine, Sapporo, Japan.