Recanalisation after intravenous thrombolysis: Does a recanalisation time window exist? - Wunderlich, MT; Goertler, M; Postert, T; Schmitt, E; Seidel, G; Gahn, G; Samii, C; Stolz, E; for the Duplex Sonography in Acute Stroke (DIAS) Study Group and the Competence Network Stroke (Neurology, 2007)