Study Protocol on Defining Core Outcomes and Data Elements in Chronic Subdural Haematoma. Issue 4 (15th September 2021) - Holl, Dana C; Chari, Aswin; Iorio-Morin, Christian; Dammers, Ruben; van der Gaag, Niels A; Kolias, Angelos G; Hutchinson, Peter J; Edlmann, Ellie