1. Division of Microbiology, Department of Pathology and Microbiology, Nihon University School of Medicine, Tokyo, Japan;
2. Majima Clinic, Tokyo, Japan;
3. Division of Physiology, Department of Biomedical Sciences, Nihon University School of Medicine, Tokyo, Japan;
4. Division of Anatomical Science, Department of Functional Morphology, Nihon University School of Medicine, Tokyo, Japan