title: Methodological issues in prevention research on drug use and pregnancy.
authors.affiliation: University of Washington School of Social Work, Seattle 98195.
authors.forename: L D
authors.initials: LD
authors.lastname: Gilchrist
authors.forename: M R
authors.initials: MR
authors.lastname: Gillmore
mesh_terms: D005260:Female; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000139:chemically induced* / Q000517:prevention & control; D012107:Research Design; D019966:Substance-Related Disorders / Q000150:complications* / Q000517:prevention & control