1. Department of Biomedical Information Sciences, Graduate School of Information Sciences, Hiroshima City University 3‐4‐1, Ozukahigashi, Asaminami‐ku Hiroshima 731‐3194 Japan
2. Division of Host Defense Sciences, Omics Health Sciences, Department of Integrated Health Sciences, Graduate School of Medicine, Nagoya University, Tokai National Higher Education and Research System 1‐1‐20, Daiko‐Minami, Higashi‐ku Nagoya Aichi 461‐8673 Japan
3. Departmet of Thoracic Surgery, Gifu Prefectural Tajimi Hospital 5‐161, Maebatacho, Tajimi Gifu 507‐8522 Japan