Affiliation: | 1.Vestre Viken Hospital Trust, Ringerike, Servicebox 13, 3530, Hønefoss, Norway ;2.Department of Health Sciences, Buskerud University College, Drammen, Norway ;3.The R & D Group, Department of Medical Biochemistry, Oslo University Hospital, Ullevål, Oslo, Norway ;4.Department of Neurology, Vestre Viken Hospital Trust, Buskerud, Norway ;5.Department of Radiology, Vestre Viken Hospital Trust, Buskerud, Norway ;6.Section of Biostatistics, Oslo University Hospital, Ullevål, Oslo, Norway ; |