Rebecca, Oxford and Harvard universities have carried out research on dimorphism within brain structure, and quite a few other research facilities. There are papers on line, and I’m confident research is ongoing. There is a brain scan which can confirm the incongruent dimorphism in the Bed Nucleus which was initially discovered in dissected brains. I believe this will be the future diagnosis for gender incongruence.
I have also encountered some researchers who have agendas, so before you offer your services, check them out!
Hugs,
Allie