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 Republic of Korea
3. Department of Histology and Embryology Tokyo Dental College Tokyo Japan
4. Division of Internal Medicine Jikou‐kai Clinic of Home Visits Sapporo Japan
5. Department of Anatomy and Embryology School of Medicine, Complutense University Madrid Spain