1. Department of Medical Physics , ul. Ku Sloncu 12, 71-073 , Szczecin , Poland , Tel.: + 48 91 441 4520; mobile: + 48 602106702
2. Department of Medical Physics , Pomeranian Medical University , Szczecin , Poland
3. Department of Neonatal Diseases , Pomeranian Medical University , Szczecin , Poland
4. Department of Ophthalmology , Pomeranian Medical University , Szczecin , Poland