[1] Pontificia Univ Catolica Rio Grande do Sul, Sch Med, Porto Alegre, RS, Brazil
[2] Hosp Moinhos Vento, Dept Urol, Porto Alegre, RS, Brazil
[3] Anatpat, Dept Pathol, Porto Alegre, RS, Brazil
[4] Pontificia Univ Catolica Rio Grande do Sul, Porto Alegre, RS, Brazil