Adult 1 Aortic Valve 1 Aortic Valve Stenosis 1 Bicuspid Aortic Valve Disease 1 Hemorrhage 1 Humans 1 Intracranial Aneurysm 1 Neurology 1 Prevalence 1 Prospective Studies 1 Registries 1 adult 1 aortic valve 1 aortic valve stenosis 1 bicuspid aortic valve 1 bleeding 1 diagnostic imaging 1 human 1 intracranial aneurysm 1 intracranial aneurysms neurology 1 prevalence 1 prospective study 1 register 1 sub‐arachnoid hemorrhage 1