1. Department of Anesthesia; ZNA Middelheim; Queen Paola Children's Hospital; Antwerp Belgium
2. Department of Child and Adolescent Psychiatry/Psychology; Erasmus MC - Sophia Children's Hospital; Rotterdam The Netherlands
3. Department of Anesthesia; Erasmus MC - Sophia Children's Hospital; Rotterdam The Netherlands
4. Institute for Medical Technology Assessment; Erasmus University Rotterdam; Rotterdam The Netherlands
5. Department of Pediatric Surgery; Erasmus MC - Sophia Children's Hospital; Rotterdam The Netherlands
6. Department of Anesthesiology; Hôpital Jeanne de Flandre; University Hospital Lille; Lille France
7. Department of Ear, Nose and Throat surgery; ZNA Middelheim; Queen Paola Children's Hospital; Antwerp Belgium
8. Department of Child and Adolescent Psychiatry; University of Copenhagen; Copenhagen Denmark
9. Research Institute of Child Development and Education; Academic Center for Child and Adolescent Psychiatry; Academic Medical Center; University of Amsterdam/de Bascule; Amsterdam The Netherlands