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APA Citation
Keller, T., Freynhagen, R., Tölle, T., Liwowsky, I., Möller, P., Hüllemann, P., Gockel, U., Stemmler, E., & Baron, R. (n.d.). a retrospective analysis of the long-term test–retest stability of pain descriptors of the painDETECT questionnaire. Current medical research and opinion, 32, 343–349. http://access.bl.uk/ark:/81055/vdc_100057498755.0x000038