Impact of the weekend effect on outcome after microsurgical clipping of ruptured intracranial aneurysms - Lukas Goertz; Christoph Kabbasch; Muriel Pflaeging; Lenhard Pennig; Kai Roman Laukamp; Marco Timmer; Hanna Styczen; Gerrit Brinker; Roland Goldbrunner; Boris Krischek (Acta Neurochirurgica, 2021)