The rational use of episiotomy in a Brazilian universitary hospital of tertiary care - Duarte, Geraldo; Marchesi, R. F.; Fiorini, C. S.; Cavalli, R. C.; Quintana, Silvana Maria; Berezowski, Aderson Tadeu; Beitune, P. El (Figo World Congress of Gynecology and Obstetrics, 2006)