I did not get my information from a study, but from 'trial and error' medical accounts dealing with a person's personality/deep-intergraded-instinct conflict with their physical gender.
Well, you can't argue with anecdotal evidence.
'trial and error' medical accounts
So what you are saying is, this is based on anecdotal evidence rather a single, objective entity gathering data on multiple patients? If my understanding of your post 64 is incorrect, please expound.