immune thrombocytopenia treatmentidiopathic immune thrombocytopeniachronic immune thrombocytopeniaprimary immune thrombocytopeniaimmune thrombocytopenia purpuraitp immune thrombocytopeniaimmune cytopeniaautoimmune thrombocytopeniaacute immune thrombocytopenic purpuraitp immuneitp immune disordersecondary thrombocytopenia