患者男性,50岁,因夜间阵发性呼吸困难入院,诊断为二尖瓣狭窄,入院评估发现患者呈二尖瓣面容,收集此资料的方法属于( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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