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The search terms ‘Proteomics' or ‘Metabonomics' and ‘Hepatocellular Carcinoma' and ‘Biomarker' were entered into the search engine PubMed (http://www.ncbi.nlm.nih.gov/pubmed). For the identification of metabonomic publications, an additional Google Scholar search was conducted for the time range 2003–2013 (http://scholar.google.co.uk/).
