Peak expiratory flow rate (PEFR) measurement & explanation - OSCE Guide - YouTube
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Peak Flow - Normal Values
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Peak flow test | British Lung Foundation
NHS website
EN 23747 Peak Flow - Industry Standard for Peak Expiratory Flow measurement
B8L07109 - Peak Flow Meter | Philip Harris
Peak flow test | Asthma UK
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Rossmax Standard Range Adult Peak Flow Meter - Medigenix
Peak Flow Meter - Standard
