1. Department of Anesthesiology, Amsterdam UMC, University Hospital Amsterdam, P.O. Box 22660, 1100 DD, Amsterdam, Netherlands
2. Department of Anesthesiology, Erasmus MC-Sophia Children’s Hospital, Erasmus University Medical Center, P.O. Box 2040, 3000 CA, Rotterdam, Netherlands
3. Center for Pain Medicine, Erasmus MC, Erasmus University Medical Center, P.O. Box 2040, 3000 CA, Rotterdam, Netherlands
4. Medical Library, Erasmus MC, Erasmus University Medical Center, P.O. Box 2040, 3000 CA, Rotterdam, Netherlands