1. Department of Anesthesiology and Algology University Hospital Gasthuisberg Leuven Belgium
2. Department of Anesthesiology and Algology GZA Hospitals Antwerp Belgium
3. Department of Anesthesiology Radboud University Medical Centre Nijmegen Nijmegen The Netherlands
4. Department of Anesthesiology University Hospital of Antwerp Antwerp Belgium
5. Department of Anesthesiology Erasmus MC—Sophia Children's Hospital Rotterdam The Netherlands
6. Durham Research Methods Centre Durham University Durham UK
7. Interuniversity Institute for Biostatistics and statistical Bioinformatics (I‐BIOSTAT) Universities of Leuven and Hasselt Leuven and Diepenbeek Belgium