GPT and hepatitis B virus infection: According to the Finnish Red Cross, the prevalence of hepatitis B and C are 0.03% and 0.05%, respectively, among Finnish blood donors and even though we have excluded individuals with ALT, AST and GT levels over the Nordic reference ranges from transcriptomics and metabolomics analysis, we cannot exclude that some of the study subject may have had steatohepatitis, which could affect the these results.