[1] Dept Urol, Murakamishi, Japan
[2] JA Niigata Kouseiren Murakami Gen Hosp, Dept Gastroenterol, Midorimachi 5-8-1, Murakamishi, Niigata 9588533, Japan
[3] Niigata Med Ctr, Dept Pathol, Kobari 3-27-11,Nishi ku, Niigata 9502022, Japan
[4] JA Niigata Kouseiren Murakami Gen Hosp, Dept Urol, Midorimachi 5-8-1, Murakamishi, Niigata 9588533, Japan