Age at diagnosis in patients with chronic congenital endocrine conditions: a regional cohort study from a reference center for rare diseases oleh Wafa Kallali, Claude Messiaen, Roumaisah Saïdi, Soucounda Lessim, Magali Viaud, Jerome Dulon, Mariana Nedelcu, Dinane Samara, Muriel Houang, Bruno Donadille, Carine Courtillot, GianPaolo de Filippo, Jean-Claude Carel, Sophie Christin-Maitre, Philippe Touraine, Irene Netchine, Michel Polak, Juliane Léger