The laboratory code numbers are inicated in each box in the respective histograms

<p><b>Copyright information:</b></p><p>Taken from "Establishment of the 1World Health Organization International Standard for DNA for nucleic acid amplification technique (NAT)-based assays"</p><p>http://www.malariajournal.com/content/7/1/139</p><p>Malaria Journal 2008;7():139-139.</p><p>Published online 24 Jul 2008</p><p>PMCID:PMC2518157.</p><p></p