ASA 81mg
Myelosuppressive agents (hydroxyurea, Interferon-α)
Anagrelide
Essential thrombocytosis
Myelofibrosis
Polycythemia vera
Chronic myelogenous leukemia 
Immune thrombocytopenic purpura
Polycythemia vera 
Thrombotic thrombocytopenic purpura
Acute blood loss