1 Vanderbilt Kennedy Center for Research on Human Development and Department of Hearing and Speech Sciences, Vanderbilt University, 230 Appleton Place, PMB 74, Nashville, TN, 37203, USA. [email protected].
2 Department of Psychology, University of Washington, CHDD Box 357920, Seattle, WA, 98195-7920, USA. [email protected].
3 Department of Psychology, University of Waterloo, Waterloo, ON, N2L 3G1, Canada. [email protected].
4 Treatment and Research Institute for Autism Spectrum Disorders (TRIAD), Vanderbilt Kennedy Center, 230 Appleton Place, PMB 74, Nashville, TN, 37203-5721, USA. [email protected].
5 University of Miami, P.O. Box 249229, Coral Gables, FL, 33101-0721, USA. [email protected].
6 Department of Psychology, University of Washington, CHDD Box 357920, Seattle, WA, 98195-7920, USA. [email protected].