Regional differences in thrombectomy rates: secondary use of billing codes in the MIRACUM (Medical Informatics for Research and Care in University Medicine) Consortium - Haverkamp, C; Gansland, T; Horki, P; Boeker, M; Dörfler, A; Schwab, S; Berkefeld, J; Pfeilschifter, W; Niesen, W-D; Egger, K; Kaps, M; Brockmann, MA; Neumaier-Probst, E; Szabo, K; Skalej, M; Bien, S; Best, C; Prokosch, U; Urbach, H (Clin Neuroradiol, 2018)