1. Chair and Department of Neonatology, Poznan University of Medical Sciences, Poznań, Poland.
2. Department of Newborns' Infectious Diseases, Poznan University of Medical Sciences, Poznań, Poland.
3. Students' Research Group at the Department of Neonatology, and Poznan University of Medical Sciences, Poznań, Poland.
4. Department of Otolaryngology and Oncological Laryngology, Poznan University of Medical Sciences, Poznań, Poland.