1. University Children's Hospital; Department of Neonatology; Tuebingen Germany
2. Dumfries and Galloway Royal Infirmary; Bankend Road Dumfries Scotland UK DG1 4AP
3. University of Montreal; Research Centre, CHU Sainte-Justine and the Department of Pediatrics; 3175 Cote Sainte-Catherine Montreal Québec Canada H3T 1C5
4. St Josefs Krankenhaus; Hermann-Herder-Str.1 Freiburg Germany 79104
5. Insitute of Medical Biometry and Medical Informatics, University Medical Center Freiburg; German Cochrane Centre; University Medical Center Freiburg Stefan-Meier-Str. 26 Freiburg Germany D-79104