1. Department of Neonatology, Thomayer Hospital, Prague, Czech Republic and Second Faculty of Medicine, Charles University, Prague, Czech Republic
2. Department of Obstetrics and Gynecology/Neonatology, University Hospital Motol, Second Faculty of Medicine, Charles University, Prague, Czech Republic
3. Department of Otorhinolaryngology, 2nd Faculty of Medicine, Charles University, Prague, Faculty Hospital Motol, Czech Republic
4. Department of Neonatology, Thomayer Hospital, Prague, Czech Republic
5. Department of Obstetrics and Gynecology, Coombe Women and Infants University Hospital, University College Dublin, Ireland
6. Department of Neonatology, Thomayer Hospital, Prague and Institute of Pathological Physiology, First Faculty of Medicine, Charles University, Prague, Czech Republic