1. Department of Ophthalmology, Trauma Centre, St. Barbara Hospital, Sosnowiec, Poland
2. Chair and Clinical Department of Ophthalmology, Division of Medical Science in Zabrze, Medical University of Silesia in Katowice, Katowice, Poland
3. Collegium Medicum, WSB University, Dąbrowa Górnicza, Poland
4. The Higher School of Strategic Planning in Dąbrowa Górnicza, Dąbrowa Górnicza, Poland