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PostScript
Letter
Author's response to ‘Valsalva manoeuvre using a syringe: physics and implications’
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We were very interested in the physics explained in Leszek Pstras' letter,1 especially the influence of time on friction forces, a factor that we had not considered. In our experiment,2 …
Footnotes
Twitter Follow Mohammed Elwan at @drmhuss
Contributors All authors have discussed the issues, contributed to the writing of the letter and approved the final submission.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.