1. Department of Pediatric Ophthalmology and Strabismus, Medical University of Białystok, Białystok University Children’s Hospital, Waszyngtona Street 17, 15-274 Białystok, Poland
2. Department of Pediatric Ophthalmology and Strabismus, Białystok University Children’s Hospital, Waszyngtona Street 17, 15-274 Białystok, Poland