1. Department of Anatomy, Tokyo Dental College, Tokyo, Japan
2. Department of Neurology, Wonkwang University School of Medicine and Hospital, Institute of Wonkwang Medical Science, Iksan-si, Jeollabuk-do, Republic of Korea
3. Division of Internal Medicine, Jikou-kai Clinic of Home Visits, Sapporo, Japan
4. Department of Anatomy, School of Medicine, International University of Health and Welfare, Narita, Japan