1. Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt, Goethe University, 60590 Frankfurt, Germany
2. Department for Anesthesia, Montreal Children’s Hospital, Montreal, QC 1001, Canada
3. Institute for Medical Statistics, Informatics, and Epidemiology (IMSIE), University Hospital Cologne, University of Cologne, 50923 Cologne, Germany
4. Department of Anesthesiology, University Medical Center of the Johannes Gutenberg-University, 55131 Mainz, Germany
5. Discipline of Anesthesiology, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo 05403-010, Brazil
6. The Jackson Rees Department of Anaesthesia, Alder Hey Children’s Hospital, Liverpool L12 2AP, UK
7. Department of Anesthesiology, Critical Care and Pain Medicine, Harvard Medical School, Boston Children’s Hospital, Boston, MA 02115, USA
8. Department for Paediatric Anaesthesia, Children’s Hospital Cologne, 50735 Cologne, Germany
9. Faculty for Health, University of Witten/Herdecke, 58455 Witten, Germany