1 From the Critical Care and Pain Unit, Department of Anesthesia, University General Hospital (CSR), Division of Research Methodology, European University, Valencia, Spain (CSR), Anæstesi og Operationsklinikken, Juliane Marie Center, Rigshospitalet TR for Overlægeforeningen (AA), Department of Pediatric and Obstetric Anesthesia, University of Copenhagen, Rigshospitalet, Denmark (AA) and Department of Anaesthesia, Critical Care Medicine, Emergency Medicine and Pain Medicine, University Hospitals of Wuerzburg, Wuerzburg, Germany (PK).