[1] Univ Eastern Finland, Dept Ophthalmol, Inst Clin Med, FIN-70211 Kuopio, Finland
[2] Kuopio Univ Hosp, Dept Ophthalmol, SF-70210 Kuopio, Finland
[3] Univ Eastern Finland, Inst Clin Med, Dept Neurol, Kuopio, Finland
[4] Kuopio Univ Hosp, Dept Neurol, SF-70210 Kuopio, Finland