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A child with severe stridor

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  • Contributors THC contributed to acquisition of data, revising the manuscript critically for important intellectual content, and final approval of the version to be published. YHT contributed to acquisition of data, or analysis and interpretation of data. SNY contributed to acquisition of data, analysis and interpretation of data, and drafting the manuscript for intellectual content.

  • Competing interests None.

  • Patient consent Obtained.

  • Provenance and peer review Not commissioned; internally peer reviewed.