1. Department of Medical & General Sciences, Faculty of Health Sciences, Nihon Institute of Medical Sciences, 1276 Simogawara, Moroyama, Iruma, Saitama 350-0435, Japan
2. Department of Legal Medicine, Shiga University of Medical Science, Tsukinowa, Seta, Otsu, Shiga 520-2192, Japan
3. Department of Anatomy, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura, Chuo-ku, Niigata 951-8580, Japan