Department of Infectious;
Respiratory;
and Digestive Medicine;
Graduate School of Medicine;
University of the Ryukyus;
Okinawa 903-0215;
Japan;
Department of Regenerative Medicine;
Graduate School of Medicine;
University of the Ryukyus;
Okinawa 903-0215;
Japan;
Department of Basic Laboratory Sciences;
School of Health Sciences in the Faculty of Medicine;
University of the Ryukyus;
Okinawa 903-0215;
Japan;
Okayama Saidaiji Hospital;
Okayama 704-8192;
Japan;
Division of Pediatric Dentistry;
Graduate School of Medical and Dental Science;
Niigata University;
Niigata 951-8514;
Japan;
Department of Urology;
Okayama Univer sity Graduate School of Medicine;
Dentistry and Pharmaceutical Sciences;
Okayama 700-8558;
Japan;