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Spirometry before and after the onset of dyspnoea in the girl described in Case 2 showing the marked decrease in the inspiratory and expiratory portion of the flow–volume loop in association with an inspiratory wheeze-like sound (technically a high-pitched stridor on inspiration) and a monophonic wheeze on expiration (see video 2 with audio in the supplementary material). Reproduced from [6] with permission from the publisher.
