1. Department of Anesthesiolgy, University Medical Center Hamburg-Eppendorf, Hamburg
2. Department of Anesthesia, Hospital Hallerwiese – Cnopf Children's Hospital, St.-Johannis-Mühlgasse 19, Nürnberg
3. Department of Anaesthesia, Paediatric Intensiv Care and Emergency Medicine, Auf der Bult Children’ s Hospital, Hannover, Germany