Ethical approval
DACSUHS, CSDH
CHRONIC SUBDURAL HEMATOMA
The study was approved by the Danish Data Protection Agency (journal no.18/20513) and the Scientific Ethical Committee of Copenhagen (project ID: S-20180010). Oral and written informed consent was obtained from the participants, whereby they accepted participation in the study and gave permission to data extraction from the electronical medical record. All data was registered in an online database (REDCap—Research Electronic Data Capture system) via an encrypted connection and anonymized to fulfil the demands for data protection.This study was designed and conducted by members of the Danish Chronic Subdural Hematoma Study (DACSUHS), a national steering group with representatives from all four neurosurgical departments in Denmark. DACSUHS coordinates CSDH management and research in Denmark.