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Cignacco, E; Denhaerynck, K; Nelle, M; Bührer, C; Engberg, S (2009). Variability in pain response to a non-pharmacological intervention across repeated routine pain exposure in preterm infants: a feasibility study. Acta paediatrica, 98(5), pp. 842-6. Oslo: Wiley 10.1111/j.1651-2227.2008.01203.x
