I had been wondering how a study of the quality of this one could have made it through the peer-review process to publication:
Is synaesthesia more common in autism? by Simon Baron-Cohen, Donielle Johnson, Julian Asher, Sally Wheelwright, Simon E Fisher, Peter K Gregersen and Carrie Allison. Molecular Autism. published November 20th 2013, 4:40 doi:10.1186/2040-2392-4-40
But I've had a look at the homepage of that journal and now I'm not wondering any more. Prof. Simon Baron-Cohen is one of the two editors-in-chief of the autism research journal.