![Person-using-PEF-peak-flow-measurement-to-test-peak-expiratory-flow-rate,-asthma](https://videocdn.cdnpk.net/harmony/content/video/partners0959/thumbnails/BB_871e7074-33aa-4b5c-80f9-33a797c31a96_small.jpg)
Person using PEF peak flow measurement to test peak expiratory flow rate, asthma
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