1. Medical School, Yeditepe University, Istanbul, Turkey 2Department of Microbiology and COE Program in the 21st Century, University of Shizuoka School of Pharmaceutical Sciences, Shizuoka, Japan 3Department of Immunology and Medical Zoology, Fukui Medical University, Matsuoka, Fukui, Japan 4Department of Food Science, Shizuoka Eiwa Gakuen University Junior College, Shizuoka, Japan