Ancillary research ETAP-ASD Environmental exposure to air pollution and autism spectrum disorder in children Abstract Elena-SNDS Care pathway for children with autism spectrum disorder included in the ELENA cohort: matching to the national health data system Abstract EnviroDisorders Environmental pesticides and genetic predisposition: a path toward autism spectrum disorders Abstract FRATSA Screening for neurodevelopmental disorders in siblings of children with autism diagnosed in tertiary centerso. Abstract Nutril Pilot study on early feeding in the first year of life and ASD severity in the ELENA cohort Abstract Elena-Covid Impact of COVID-19 containment on children and adolescents with autism spectrum disorder (ASD) included in the ELENA cohort and their parents Abstract LEDA Study of the link between intestinal dysbiosis and the integrity of the blood brain barrier in autism Abstract