Barke, A., Riecke, J., Rief, W. et al. (2015). The Psychological Inflexibility in Pain Scale (PIPS) – validation, factor structure and comparison to the Chronic Pain Acceptance Questionnaire (CPAQ) and other validated measures in German chronic back pain patients. BMC Musculoskelet Disord, 16, 171. https://doi.org/10.1186/s12891-015-0641-z The German version of the PIPS is in the article's "Additional File."
