女,10岁,门诊时可见患儿不自主的做鬼脸、转颈、耸肩、手指间断性伸曲、摆手和伸臂等,家属述此症状睡眠时可减轻或消失,此症状是( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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