Acute alterations in anorectal manometry induced by proximal and distal sphincterotomy: experimental studies on piglets - Mehl, Josimeire Batista; Vicente, Yvone Avalloni M. V. de Andrade; Dantas, Roberto Oliveira; Elias Júnior, Jorge; Cambrea, Carlos Roberto; Rocha, Maria Cecília (Pediatric Surgery International, 2008)