Uncertainty of measurement for competitive and indirect ELISAs., Toussaint, J F., Assam P, Cay Ann Brigitte, Dekeyser F, Knapen K, Imberechts Hein, Goris N, Molenberghs G, Mintiens K, and De Clercq Kris , Rev Sci Tech, 2007 Dec, Volume 26, Issue 3, p.649-56, (2007)