1. Private Healthcare Institution Vase Zdravlje, Tuzla 75000, Bosnia and Herzegovina
2. Department of Ophthalmology, University Clinical Centre “Sestre Milosrdnice”, Eye Clinic, Zagreb 10000, Croatia
3. Cancer Epidemiology Unit, Department of Medical Sciences, University of Turin, CPO-Piemonte, Turin 10125, Italy
4. Department of Ophthalmology, University Clinical Centre Tuzla, Tuzla 75000, Bosnia and Herzegovina
5. Faculty of Health Studies, University of Bihać, Bihać 77000, Bosnia and Herzegovina