Chronicity of sleep problems in children with chronic illness: a longitudinal population-based study
Child and Adolescent Psychiatry and Mental Health (2009) - Comment
pubmed: 19712458  doi: 10.1186/1753-2000-3-22  issn: 1753-2000 

Børge Sivertsen, Mari Hysing, Irene Elgen, Kjell Morten Stormark, Astri J Lundervold