Non-verbal IQ and change in restricted and repetitive behavior throughout childhood in autism: a longitudinal study using the Autism Diagnostic Interview-Revised oleh V. Courchesne, R. Bedford, A. Pickles, E. Duku, C. Kerns, P. Mirenda, T. Bennett, S. Georgiades, I. M. Smith, W. J. Ungar, T. Vaillancourt, A. Zaidman-Zait, L. Zwaigenbaum, P. Szatmari, M. Elsabbagh, Pathways Team