title: Rheumatology in philately.
authors.forename: I
authors.initials: I
authors.lastname: Leden
mesh_terms: D002170:Canada; D004739:England; D049672:History, 19th Century; D049673:History, 20th Century; D010678:Philately; D012219:Rheumatology / Q000266:history; D012426:Russia