title: [Are vitamin B12 deficiency and folic acid deficiency underestimated among persons on long-term sick leave?].
authors.forename: Bo
authors.initials: B
authors.lastname: Norberg
mesh_terms: D005494:Folic Acid Deficiency / Q000175:diagnosis* / Q000453:epidemiology; D006801:Humans; D018582:Sick Leave; D014806:Vitamin B 12 Deficiency / Q000175:diagnosis* / Q000453:epidemiology