title: Philadelphia chromosome-negative myeloproliferative disorders: an historical perspective.
authors.forename: Josef T
authors.initials: JT
authors.lastname: Prchal
mesh_terms: D000818:Animals; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007865:Leeches; D009196:Myeloproliferative Disorders / Q000235:genetics* / Q000266:history; D010677:Philadelphia Chromosome; D018962:Phlebotomy / Q000266:history / Q000379:methods; D011087:Polycythemia Vera / Q000235:genetics / Q000266:history