[1] 10th Mil Res Hosp & Polyclin, Dept Neurol, Bydgoszcz, Poland
[2] Nicolaus Copernicus Univ, Dept Hyg Epidemiol & Ergon, Torun, Poland
[3] 10th Mil Res Hosp & Polyclin, Dept Ophthalmol, Bydgoszcz, Poland
[4] Newcastle Univ, Inst Cellular Med, Newcastle Upon Tyne, Tyne & Wear, England