1. Tokyo University of Agriculture and Technology, Graduate School of Bio-Application and Systems Engineering, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
2. National Defense Medical College, Department of Surgery, 3-2, Namiki, Tokorozawa, Saitama 359-8513, Japan
3. National Defense Medical College Research Institute, Division of Biomedical Information Sciences, 3-2, Namiki, Tokorozawa, Saitama 359-8513, Japan