1. Beek TF, Cohen-Kettenis PT, Kreukels BPC. Gender incongruence/gender dysphoria and its classification history. Int Rev Psychiatry Abingdon Engl. 2016;28:5–12.
2. Tate CC, Ledbetter JN, Youssef CP. A two-question method for assessing gender categories in the social and medical sciences. J Sex Res. 2013;50:767–76.
3. Department of Gender, Women and Health; World Health Organization (WHO). Gender mainstreaming for health managers: a practical approach. Geneva: World Health Organiztion; 2011.
4. Bauer G. Making Sure Everyone Counts: Considerations for Inclusion, Identification and Analysis of Transgender and Transsexual Participants in Health Surveys. In: Institute of Gender and Health CIoHR, editor. What a Difference Sex and Gender Make: A Gender, Sex and Health Research Book. Vancouver, British Columbia: Institute of Gender and Health, Canadian Institutes of Health Research; 2012. p. 59–67.
5. Dhejne C, Lichtenstein P, Boman M, Johansson AL, Långström N, Landén M. Long-term follow-up of transsexual persons undergoing sex reassignment surgery: Cohort study in Sweden. PLoS One. 2011;6:e16885.