Ljungman , G., A. Kreuger, T. Gordh, and S. Sörensen. “Pain in Pediatric Oncology: Do the Experiences of Children and Parents Differ from Those of Nurses and Physicians?”. Upsala Journal of Medical Sciences, vol. 111, no. 1, July 2009, pp. 87–96, doi:10.3109/2000-1967-023.