Faculty of Science and Engineering, Gunma University, Kiryu-shi, Gunma, 376-8515, Japan. katotsu@cs.gunma-u.ac.jp.|Faculty of Science and Engineering, Gunma University, Kiryu-shi, Gunma, 376-8515, Japan.|Faculty of Science and Engineering, Gunma University, Kiryu-shi, Gunma, 376-8515, Japan.|Faculty of Science and Engineering, Gunma University, Kiryu-shi, Gunma, 376-8515, Japan.|Gunma University Hospital, Maebashi-shi, Gunma, 371-8511, Japan.|Research Division, Mitsubishi Tanabe Pharma Corporation, Toda-shi, Saitama, 335-8505, Japan.|Research Division, Mitsubishi Tanabe Pharma Corporation, Toda-shi, Saitama, 335-8505, Japan.