1. Department of Histology and Developmental Biology, Tokyo Dental College, Tokyo, Japan
2. Department of Pharmacology, Tokyo Dental College, Tokyo, Japan
3. Department of Anatomy, Jeonbuk National University Medical School, Jeonju, Korea
4. Division of Internal Medicine, Cupid Clinic, Iwamizawa, Japan
5. Department of Anatomy and Embryology, School of Medicine, Complutense University, Madrid, Spain
6. Department of Anatomy, Tokyo Dental College, Tokyo, Japan