+[Veale, Clarke, and Lomax](/papers/veale-lomax-clarke-identity_defense_model.pdf) attribute the differences to whether defense mechanisms are used to suppress a gender-variant identity.
+
+[Vitale] http://www.avitale.com/developmentalreview.htm
+
+[Serano 2020]
+
+Is a two type typology of male-to-female transsexualism a good theory? Is it "really" different conditions, or slightly different presentations of "the same" condition?