女性，30岁，月经量增多半年，皮肤瘀点、瘀斑2个月就诊。检验：RBC3.05×1012/L，Hb90g/L，WBC8.9×109/L，PLT22×109/L，血小板相关抗体阳性，骨髓象示巨核细胞增生明显活跃，以颗粒型为主，网织红细胞2.0%。该例最可能的诊断是

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