In the four articles: Factors associated with hospitalizations among adults with diabetes in France. Entred 2007: Hospitalizations among children with diabetes in France in 2007–2008. Entred-Enfant 2007 Study: Out-of-pocket costs for diabetic patients in France in 2007. Type 1 diabetes in mainland France: characteristics, vascular risk, frequency of complications, and quality of care. Entred 2001 and Entred 2007