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Correct determination of critical flicker frequency is mandatory when comparisons to other tests are made

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  • Contributors GK and NH: Conception, design, analysis, interpretation of data and drafting the article. DH: Interpretation of data, critical revision of the article for important intellectual content, and final approval of the version to be published.

  • Competing interests The authors (GK and DH) belong to a group of patent holders for a portable bedside device for critical-flicker-frequency analysis.

  • Ethics approval There was approval by the Ethics Committee of the Medical Faculty of Heinrich Heine University Düsseldorf for all single studies in Hepatic Encephalopathy including CFF measurements.

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

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