1. Department of Urology, Graduate School of Medicine; University of the Ryukyus; Okinawa Japan
2. Shuri Jokamachi Clinic Daiichi; Okinawa Japan
3. Ginowan-kinen Hospital; Okinawa Japan
4. Department of Cardiovascular Medicine, Nephrology and Neurology; University of the Ryukyus; Okinawa Japan
5. Chuzan Hospital; Okinawa Japan