Use of hyaluronidase for cervical ripening: a randomized trial - Spallicci, Maria Delizete Bentivegna; Chiea, Maria Aparecida; Singer, Júlio da Motta; Albuquerque, Paulo Basto de; Bittar, Roberto Eduardo; Zugaib, Marcelo (European Journal of Obstetrics & Gynecology and Reproductive Biology, 2007)