title: High frequency of vitamin D insufficiency in primary antiphospolipid syndrome.
authors.forename: Karin
authors.initials: K
authors.lastname: Klack
authors.forename: Jozélio Freire de
authors.initials: JF
authors.lastname: Carvalho
mesh_terms: D000328:Adult; D016736:Antiphospholipid Syndrome / Q000453:epidemiology*; D015897:Comorbidity; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D014808:Vitamin D Deficiency / Q000453:epidemiology*; D055815:Young Adult