1. Department of Neurology, Wonkwang University School of Medicine and Hospital, Institute of Wonkwang Medical Science, Iksan, Korea
2. Department of Anatomy, Tokyo Dental College, Tokyo, Japan
3. Division of Internal Medicine, Jikou-kai Clinic of Home Visits, Sapporo, Japan
4. Department of Anatomy and Human Embryology, Institute of Embryology, Faculty of Medicine, Complutense University, Madrid, Spain