1. Department of Urology; Faculty of Medicine, University of the Ryukyus; Nishihara Okinawa 903-0215 Japan
2. Department of Bacteriology; Faculty of Medicine, University of the Ryukyus; Nishihara Okinawa 903-0215 Japan
3. Department of Microbiology; School of Medicine, Fujita Health University; Aichi Toyoake 470-1192 Japan