Severe maternal morbidity and maternal near miss in the extremes of reproductive age: results from a national cross- sectional multicenter study - Oliveira Júnior, Fernando César; Surita, Fernanda Garanhani; Silva, João Luiz Pinto e; Cecatti, José Guilherme; Parpinelli, Mary Angela; Haddad, Samira M.; Costa, Maria Laura; Pacagnella, Rodolfo Carvalho; Sousa, Maria Helena; Souza, João Paulo (BMC Pregnancy and Childbirth, 2014)