1. Department of Anatomy, Jeonbuk National University Medical School, Jeonju, Korea.
2. Department of Maxillofacial Anatomy, Graduate School of Tokyo Medical and Dental University, Tokyo, Japan
3. Department of Anatomy, Akita University School of Medicine, Akita, Japan
4. Division of Internal Medicine, Jikoukai Clinic for Home Visit, Sapporo, Japan.
5. Department of Anatomy and Human Embryology, Faculty of Medicine, Complutense University, Madrid, Spain.