Article 1 Craniotomy 1 Epidemiology 1 Finland 1 Finn (citizen) 1 Neurosurgery 1 Traumatic brain injury 1 adult 1 age distribution 1 aged 1 cohort analysis 1 controlled study 1 craniotomy 1 epidural hematoma female 1 health care policy 1 human 1 major clinical study 1 male 1 morbidity 1 neurosurgery 1 retrospective study 1 sex difference 1 subdural hematoma 1 traumatic brain injury 1