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    Avian, A., Messerer, B., Frey, A., Meissner, W., Weinberg, A., Ravekes, W., & Berghold, A. (2018). scaling properties of pain intensity ratings in paediatric populations using the Faces Pain Scale-revised: Secondary analyses of published data based on the item response theory. International journal of nursing studies, 87, 49–59. http://access.bl.uk/ark:/81055/vdc_100070611794.0x000050