1. From the Departments of Clinical and Community Medicine (H.L., T.W., I.N., T.I., and E.B.M.), Faculty of Health Sciences, University of Tromsø, Tromsø, Norway; Divisions of Neurosurgery and Neurology (H.L., T.I, E.B.M.), University Hospital of North Norway, Tromsø, Norway; Departments of Public Health and Community Medicine (P.R.R.) and Neuroscience (M.S.S., A.V.), Norwegian University of Science and Technology, Trondheim, Norway; Department of Neurosurgery (A.V.), St Olavs University Hospital,...