1. Division of Ophthalmology and Optometry, Department of Ophthalmology, Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland
2. Oftalmika Eye Hospital, Bydgoszcz, Poland
3. Department of Ophthalmology, Faculty of Medical Science in Katowice, Medical University of Silesia, Katowice, Poland
4. Department of Ophthalmology, Professor K. Gibiński University Clinical Center, Medical University of Silesia, Katowice, Poland