The impact of cardiac diseases during pregnancy on severe maternal morbidity and mortality in Brazil - Campanharo, Felipe F.; Cecatti, José Guilherme; Haddad, Samira M.; Parpinelli, Mary Angela; Born, Daniel; Costa, Maria L.; Mattar, Rosiane; Souza, João Paulo Dias de; Quintana, Silvana Maria (PLOS ONE, 2015)