title: [Limitations of secondary analysis of databases].
authors.forename: Lucio
authors.initials: L
authors.lastname: Huamán-Espino
authors.forename: Juan
authors.initials: J
authors.lastname: Pablo Aparco
authors.forename: Jenny
authors.initials: J
authors.lastname: Pillaca
mesh_terms: D000740:Anemia / Q000097:blood* / Q000453:epidemiology*; D005260:Female; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D011247:Pregnancy; D011250:Pregnancy Complications, Hematologic / Q000097:blood* / Q000453:epidemiology*
chemical_list: D006454:Hemoglobins