Motonobu Saito1, Takashi Kohno2, Koji Kono3. 1. Department of Gastrointestinal Tract Surgery, Fukushima Medical University School of Medicine, Fukushima, 960-1295, Japan; Division of Genome Biology, National Cancer Center Research Institute, Tokyo, 104-0045, Japan. Electronic address: moto@fmu.ac.jp. 2. Division of Genome Biology, National Cancer Center Research Institute, Tokyo, 104-0045, Japan. 3. Department of Gastrointestinal Tract Surgery, Fukushima Medical University School of Medicine, Fukushima, 960-1295, Japan.