1 Department of Neonatology, University Children's Hospital Regensburg (KUNO), Hospital St. Hedwig of the Order of St. John, University of Regensburg, Regensburg, Germany.
2 Department of Paediatric and Child Health, University College Cork, Cork, Ireland.
3 Department of Paediatrics, Institute of Clinical Medicine, Aarhus University Hospital, Aarhus, Denmark.