Collateral circulation is an independent radiological predictor of outcome after thrombolysis in acute ischaemic stroke. - Kucinski,T.; Koch,C.; Eckert,B.; Becker,V.; Kromer,H.; Heesen,C.; Grzyska,U.; Freitag,H.J.; Röther,J.; Zeumer,H. (Neuroradiology, 2003)