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