Brazilian multicentre study on preterm birth (EMIP): prevalence and factors associated with spontaneous preterm birth - Passini Júnior, Renato; Cecatti, José G.; Lajos, Giuliane J.; Tedesco, Ricardo P.; Nomura, Marcelo L.; Dias, Tabata Z.; Haddad, Samira M.; Rehder, Patricia M.; Pacagnella, Rodolfo de Carvalho; Sousa, Maria H.; Martinez, Francisco Eulógio; Quintana, Silvana Maria (PLOS One, 2014)