1 Department of Haematological Diagnostics, Medical University, Bia?ystok, Poland
2 Department of Biochemical Diagnostics, Medical University Bia?ystok, Waszyngtona 15A, Bia?ystok 15-269, Poland
3 Department of Perinatology, Medical University, Bia?ystok, Poland
4 Department of Pediatric Ophthalmology with Squint Treatment Unit, Medical University, Bia?ystok, Poland