As at date measures are a specialised variant of a normal measure which are calculated for a given date and can be used whenever a measure value is required for a particular date in the calendar only.
As at Date度量是常规度量的一种特殊变体，针对给定日期加以计算，且每当日历中的一个特定日期需要一个度量值时，都会用到它。
Objective: to analyze the misdiagnosis reasons of children's cough variant asthma (CVA) and to propose preventive measures to increase the diagnosis rate in the early stage.
目的：分析基层医院儿童咳嗽变异性哮喘(CVA)误诊原因，提出误诊预防措施。
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