1. Department of Human Anatomy and Embriology II; Faculty of Medicine, University Complutense of Madrid; Spain
2. Division of Anatomy; Department of Human Development and Fostering, Meikai University School of Dentistry; Saitama Japan
3. Division of Internal Medicine; Iwamizawa Kojin-kai Hospital; Iwamizawa Japan
4. Department of Anatomy; Tokyo Dental College; Chiba Japan