Kriechbaum, K., Michels, S., Prager, F., Georgopoulos, M., Funk, M., Geitzenauer, W. and Schmidt-Erfurth, U. (2008) Intravitreal Avastin for macular oedema secondary to retinal vein occlusion: A prospective study. British Journal of Ophthalmology, 92, 518-522.