Lessons learned from efforts to improve the quality of care in children with end-stage renal disease in the Netherlands and Belgium.

Quality improvement research strives to bridge the gap between ideal and actual care.1 Many paediatric diseases are rare, and thus there is insufficient evidence to define ‘ideal care’. Low prevalences and generally small patient numbers in centres in which children with rare diseases are treated create considerable barriers for clinical studies and for the development of evidence based guidelines. As a consequence, most existing guidelines are derived from studies in adults and lack any paediatric evidence.2 Here we focus on paediatric end-stage renal disease (ESRD) as an example of a clinical field in which these challenges are encountered.