1. University Hospital Zurich; Clinic of Neonatology; Zurich Switzerland Zurich
2. University Hospital Zürich; Department of Neonatology; Frauenklinikstrasse 10 Zürich Switzerland
3. The Louis Armstrong Center for Music and Medicine; Beth Israel Medical Center New York City USA
4. Medical Center - University of Freiburg, Faculty of Medicine; Institute for Evidence in Medicine (for Cochrane Germany Foundation); Breisacher Str. 153 Freiburg Germany D-79110