title: Studies examine pain treatment, depression ties.
mesh_terms: D000328:Adult; D002908:Chronic Disease; D015897:Comorbidity; D003866:Depressive Disorder / Q000453:epidemiology*; D006801:Humans; D008875:Middle Aged; D010146:Pain / Q000453:epidemiology*; D059408:Pain Management; D010342:Patient Acceptance of Health Care; D014481:United States / Q000453:epidemiology