Voiding dysfunction in children. Pelvic-floor exercises or biofeedback therapy: a randomized study. - Vasconcelos, Mônica; Lima, Eleonora; Caiafa, Letícia; Noronha, Alessandra; Cangussu, Renata; Gomes, Suzely; Freire, Raquel; Filgueiras, Maria; Araújo, Junia; Magnus, Gisele; Cunha, Cláudia; Colozimo, Enrico (Pediatric Nephrology, 2006)