title: [Perinatal cohort studies. Age and pregnancy as causes of skewing].
authors.forename: H
authors.initials: H
authors.lastname: Avila
authors.forename: E
authors.initials: E
authors.lastname: Casanueva
authors.forename: P
authors.initials: P
authors.lastname: Arroyo
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D008800:Mexico; D008875:Middle Aged; D010342:Patient Acceptance of Health Care; D010500:Perinatology; D011247:Pregnancy; D011295:Prenatal Care / Q000523:psychology*; D012306:Risk; D012494:Sampling Studies; D013223:Statistics as Topic
vernacular_title: Cohorte de estudios perinatales. Edad y embarazo como causas de sesgo.