Association between ischaemic stroke aetiology and leptomeningeal collateral status: a retrospective cohort study oleh Lina Sojak, Anna M. Toebak, Camilla Gallino, Tennessee von Streng, Salome Rudin, Lilian F. Kriemler, Annaelle Zietz, Benjamin Wagner, Henrik Gensicke, Raoul Sutter, Christian H. Nickel, Mira Katan, Leo H. Bonati, Marios Psychogios, Tolga D. Dittrich, Gian Marco De Marchis