Pacagnella, Rodolfo C.; Cecatti, Jose G.; Parpinelli, Mary A.; Sousa, Maria H.; Haddad, Samira M.; Costa, Maria L.; Sousa, Joao P.; Pattinson, Robert Clive; Brazilian Network for the Surveillance of Severe Maternal Morbidity study group(BioMed Central, 2014-05-05)