Defreyne J; Elaut E; Kreukels B; Fisher AD; Castellini G; Staphorsius A; Den Heijer M; Heylens G; T'Sjoen G (2020). "Sexual Desire Changes in Transgender Individuals Upon Initiation of Hormone Treatment: Results From the Longitudinal European Network for the Investigation of Gender Incongruence". J. Sex. Med. 17 (4): 812–825. doi:10.1016/j.jsxm.2019.12.020. PMID32008926.
Defreyne J; Elaut E; Kreukels B; Fisher AD; Castellini G; Staphorsius A; Den Heijer M; Heylens G; T'Sjoen G (2020). "Sexual Desire Changes in Transgender Individuals Upon Initiation of Hormone Treatment: Results From the Longitudinal European Network for the Investigation of Gender Incongruence". J. Sex. Med. 17 (4): 812–825. doi:10.1016/j.jsxm.2019.12.020. PMID32008926.