1. II Department of Ophthalmology, Pomeranian Medical University, Al. Powstańców Wlkp. 72, 70-111 Szczecin, Poland
2. Scientific Students Association of Ophtalmology, II Department of Ophthalmology, Pomeranian Medical University, Szczecin Unia Lubelska 1 Street, 71-252 Szczecin, Poland
3. Department of Paediatrics, Oncology and Paediatric Immunology, Pomeranian Medical University, 71-252 Szczecin, Poland
4. Department of Paediatric Onclogy, Great Ormond Street Hospital for Children, London WC1N 1LE, UK
5. Department of Intervantional Radiology, Pomerian Medical University, 70-111 Szczecin, Poland