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“Reversing the patch, we see the Zoom installer now invokes lchown to update the permissions of the update .pkg, thus preventing malicious subversion.”

“This is why a bipartisan pkg alone isn’t acceptable,” she continued.

He said the PKG was "very easy to use" and meant patients should "get the response back very quickly".

Patients wear the PKG over a six-day period before sending it away for data to be analysed.

As well as tracking movements, researchers say the PKG also enables medics to assess the impact of medication on the frequency and severity of symptoms.