1. Department of Public HealthOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical Science Okayama Japan
2. Third Department of Internal MedicineSchool of Medicine, University of Occupational and Environmental Health Japan Kitakyushu Japan
3. First Department of Internal MedicineSchool of Medicine, University of Occupational and Environmental Health Japan Kitakyushu Japan
4. Department of Life ScienceOkayama University of Science Okayama Japan
5. Division of Morphological Analysis, Department of Anatomy, Biology and Medicine, Faculty of MedicineOita University Yufu Oita Japan