1. School of Human Science and Environment; University of Hyogo; Himeji Hyogo 670-0092 Japan
2. Asahikawa Medical College; Asahikawa Hokkaido 078-8510 Japan
3. Research Institute for Microbial Diseases; Osaka University; Suita Osaka 565-0871 Japan
4. Sakai City Institute of Public Health; Sakai Osaka 590-0953 Japan
5. Osaka Prefecture Saiseikai-Sennan Medical Welfare Center; Sennan Osaka 590-0535 Japan