Historically, What Measures Have Been Used as a Basis for Estimating

Historically, what measures have been used as a basis for estimating the prevalence of gender dysphoria? (Select all that apply.)

A) Polls conducted by telephone
B) Use of the diagnostic codes for gender identity disorder and gender dysphoria
C) Surveys conducted on admission and discharge from hospitals
D) Rates of gender-affirming surgery
E) Applications for legal gender change