CALR and myeloproliferative neoplasm: Abbreviations: DAPT: Double anti-platelet therapy; ASA, acetylsalicylic acid; +/- Charac BM, presence/absence of a characteristic bone marrow biopsy; +/- MPN, presence/absence of another myeloproliferative neoplasm; +/- mutation, presence/absence of a JAK2/CALR/MPL-mutation; +/- other clonal, presence/absence of another clonal marker; +/- reactive, presence or absence of (evidence of) reactive thrombocytosis.