一15岁女孩,反复双下肢对称性皮肤瘀点、瘀斑,伴有四肢关节肿痛,有血尿和水肿。血小板计数正常。最可能的诊断为()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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