Long-term follow-up of JAK2 exon 12 polycythemia vera Long-term follow-up of JAK2 exon 12 polycythemia vera: a French Intergroup of Myeloproliferative Neoplasms (FIM) study Long-term follow-up of JAK2 exon 12 polycythemia vera_ a French Intergroup of Myeloproliferative Neoplasms (FIM) study RETOUR MarcGuevreguian2021-03-22T20:23:18+01:00