1. Department of Anesthesiology, University of Munich (LMU), Munich, Germany
2. Interdisciplinary Pain Centre, Klinikum Landsberg am Lech, Landsberg am Lech, Germany
3. Institute for Medical Information Processing, Biometry and Epidemiology, University of Munich, Munich, Germany
4. TUM School of Medicine, Department of Pediatrics, Technical University of Munich, Munich, Germany
5. Department of Pain Medicine, Munich Hospital Schwabing, Munich, Germany