Complex, low‐intensity, individualised naturalistic developmental behavioural intervention in toddlers and pre‐schoolers with autism spectrum disorder: The multicentre, observer‐blind, parallel‐group randomised‐controlled A‐FFIP trial - Freitag, Christine M.; Kirchner, Marietta; Sauer, Lukas D.; Kleber, Solvejg K.; Polzer, Leonie; Raji, Naisan; Lemler, Christian; Fröhlich, Ulrike; Jarczok, Tomasz; Geissler, Julia; Radtke, Franziska; Ring, Melanie; et al. (Journal of Child Psychology & Psychiatry, 2025)