Delays in receiving obstetric care and poor maternal outcomes: results from a national multicentre cross-sectional study - Pacagnella, Rodolfo C.; Cecatti, José G.; Parpinelli, Mary A.; Sousa, Maria H.; Haddad, Samira M.; Costa, Maria L.; Souza, João Paulo Dias de; Pattinson, Robert C. (BMC Pregnancy and Childbirth, 2014)