1. Department of Maxillofacial Anatomy and Neuroscience, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima 734-8553, Japan
2. Faculty of Dentistry, Hiroshima University, Hiroshima 734-8553, Japan
3. Department of Medicine, Clinical Academic Building, Robert Wood Johnson Medical School, Rutgers University, New Brunswick, New Jersey 08854, USA