[Comment on article "Risk factors associated with preterm birth in a second level hospital"]

Sofhya Marylett Sánchez-Morales1, Ivonne Analí Roy-García2, Rodolfo Rivas-Ruiz2

  • 1Secretaría de Salud, Dirección General de Calidad y Educación en Salud. Ciudad de México, México.

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