Affiliation: | (1) Department of oral Surgery, Nagoya University School of Medicine, Nagoya, Japan;(2) Laboratory of Germfree Life, Research Institute for Disease Mechanism and Control, Nagoya University School of Medicine, 466 Nagoya, Japan;(3) Department of Pathology, Faculty of Veterinary Medicine, Kasetsart University, Nakhonpathom, Thailand;(4) Department of Pediatrics, Nagoya University School of Medicine, Nagoya, Japan |