title: [Sociodemographic and obstetric factors associated with preterm birth].
authors.affiliation: Coordinación Universitaria del Hospital Civil, Universidad Autónoma de Sinaloa. fmorganortiz@hotmail.com
authors.forename: Fred
authors.initials: F
authors.lastname: Morgan-Ortiz
authors.forename: Ariana
authors.initials: A
authors.lastname: Cinco-Sánchez
authors.forename: Francisco A
authors.initials: FA
authors.lastname: Douriet-Marín
authors.forename: Josefina
authors.initials: J
authors.lastname: Báez-Barraza
authors.forename: Jairo
authors.initials: J
authors.lastname: Muñoz-Acosta
authors.forename: Ignacio
authors.initials: I
authors.lastname: Osuna-Ramirez