Impact of bone marrow fibrosis grade in postpolycythemia vera and postessential thrombocythemia myelofibrosis: A study of the MYSEC group Impact of bone marrow fibrosis grade in postpolycythemia vera and postessential thrombocythemia myelofibrosis: A study of the MYSEC group ajh.25644 RETOUR MarcGuevreguian2021-03-23T10:37:18+01:00