1. Department of Neonatology, Inselspital, University Children’s Hospital, Bern, Switzerland
2. Department of Health Professionals, Bern University of Applied Science, Bern, Switzerland
3. Department of Clinical Research, Clinic of Neonatology, University Hospital, Zurich, Switzerland
4. Department of Health Services Research, Caphri, Maastricht University, Maastricht, Netherlands