Affiliation: | (1) Clinic of Neonatology, University Hospital, Frauenklinikstrasse 10, CH-8091 Zurich, Switzerland;(2) Neonatal Unit, Hospital Zollikerberg, Zurich, Switzerland;(3) Neonatal Unit, Hospital Triemli, Zurich, Switzerland;(4) Division of Paediatric Cardiology, University Children’s Hospital, Zurich, Switzerland |