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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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