I'm gathering together the various references I've mentioned on this blog (and occasionally elsewhere) to put together what I've referred to as "the puzzle".
It's a continuing work in progress, as new data is coming in all the time. I should also systematise it, perhaps by date, so I can just append or prepend new articles as they come in. There's a lot, and I've missed out quite a bit, so it will be continuously updated just to correct the omissions.
Along with the academic reference, there's the URL, and selected quotes from the papers in question, usually from the abstracts.
It's available as a separate page, on the left column. Transsexual and Intersex Gender Identity