[1] Folkhalsan Res Ctr, Helsinki, Finland
[2] Univ Helsinki, Dept Nephrol, Helsinki, Finland
[3] Helsinki Univ Hosp, Abdominal Ctr, Helsinki, Finland
[4] Univ Helsinki, Dept Ophthalmol, Helsinki, Finland
[5] Helsinki Univ Hosp, Helsinki, Finland
[6] Karolinska Univ Hosp, Dept Radiol, Stockholm, Sweden
[7] Karolinska Inst, Stockholm, Sweden
[8] Stanford Univ Hosp, Dept Radiol, Stanford, CA 94305 USA
[9] Helsinki Univ Hosp, Dept Neurol, Helsinki, Finland
[10] Univ Gothenburg, Dept Neurol, Gothenburg, Sweden
[11] Sahlgrens Univ Hosp, Gothenburg, Sweden
[12] Helsinki Univ Hosp, Dept Radiol, Helsinki, Finland