1. Departments of Cardiology, Osaka Medical College, Osaka, Japan;
2. Department of Pathology, National Institute of Infectious Diseases, Tokyo, Japan;
3. Departments of Otolaryngology-Head and Neck Surgery, Osaka Medical College, Osaka, Japan;
4. Departments of Pathology, Osaka Medical College, Osaka, Japan;
5. Departments of Cardiology, Osaka Medical College, Osaka, Japan