Two years ago, Soledad Angulo, the speech therapist of the voice feminization team, began the PhD in FEMINIZATION OF VOICE at the Complutense University of Madrid. Doctor Juan Carlos Casado, is among its thesis directors, and helps with the issue of voice feminization. The thesis is enabled in three articles, one of which and which they are currently working on, is the comparison of tonality results between pre and post surgery + speech therapy with pre and post speech therapy results.