Affiliation: | Departments of Oral Pathobiological Science and; Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Nishi 7, Kita 13, Kita-ku, Sapporo 060-8586, Japan.; Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, 3–1 Yamada-oka, Suita, Osaka 565-0871, Japan. |