title: A sampling of studies since 1899.
authors: Karen
authors: K
authors: Kraco
mesh_terms: D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008374:Manuscripts, Medical as Topic / Q000266:history*; D008910:Minnesota; D010506:Periodicals as Topic / Q000266:history*; D012106:Research / Q000266:history*