“…However, the definition of gender dysphoria in current research has not been uniform: prevalence numbers were based on the number of legal sex changes as noted in a national register (Veale, 2008), the start of cross-sex hormonal therapy (Bakker, van Kesteren, Gooren, & Bezemer, 1993;Eklund, Gooren, & Bezemer, 1988;Van Kesteren, Gooren, & Megens, 1996), the number of applicants for sex reassignment surgeries (SRS) (Olsson & Möller, 2003), the number of SRSs performed by different surgical centers (De Cuypere et al, 2007), or the attendance at a gender clinic (Baba et al, 2011). For example, the Belgian prevalence was based on the number of SRSs performed in Belgium, and was estimated at 1: 12,900 for male-to-female and 1:33,800 for female-to-male transsexual persons (De Cuypere et al, 2007).…”