Validation of two real-time RT-PCR methods for foot-and-mouth disease diagnosis: RNA-extraction, matrix effect, uncertainty of measurement and precision., Goris, Nesya, Vandenbussche Frank, Herr Cécile, Villers Jérôme, Van der Stede Yves, and De Clercq Kris , J Virol Methods, 2009 Sep, Volume 160, Issue 1-2, p.157-62, (2009)