1. Center for Autism Research, Children's Hospital of Philadelphia, USA
2. Department of Computer and Information Science, University of Pennsylvania, USA and Center for Autism Research, Children's Hospital of Philadelphia, USA
3. Center for Autism Research, Children's Hospital of Philadelphia, USA and Department of Psychiatry, University of Pennsylvania, USA
4. Center for Autism Research, Children's Hospital of Philadelphia, USA and Department of Pediatrics, University of Pennsylvania, USA