1. Department of Basic Medical Science for Nursing, Department of Primary Education, Yasuda Women’s University, Hiroshima, Hiroshima 731-0153, Japan
2. Department of Microbiology and Immunology, Shimane University School of Medicine, Izumo, Shimane 693-8501, Japan
3. Department of Pharmaceutical Sciences, International University of Health and Welfare, Ohtawara, Tochigi 324-8501, Japan