Christel de Blok (VU University Medical Center, Department of Endocrinology and Center of Expertise on Gender Dysphoria, Amsterdam), Nienke Nota (VU University Medical Center, Department of Endocrinology and Center of Expertise on Gender Dysphoria, Amsterdam), Justine Defreyne (Ghent University Hospital, Department of Endocrinology and Center for Sexology and Gender, Ghent), Maartje Klaver (VU University Medical Center, Department of Endocrinology and Center of Expertise on Gender Dysphoria, Amsterdam), Chantal Wiepjes (VU University Medical Center, Department of Endocrinology and Center of Expertise on Gender Dysphoria, Amsterdam), Alessandra Daphne Fisher (Careggi University Hospital, Sexual Medicine and Andrology Unit, Department of Experimental, Clinical and Biomedical Sciences, Florence), Thomas Schreiner (Oslo university hospital, Department of Endocrinology, Oslo), Martin den Heijer (VU University Medical Center, Department of Endocrinology and Center of Expertise on Gender Dysphoria, Amsterdam), Guy T'Sjoen (Ghent University Hospital, Department of Endocrinology and Center for Sexology and Gender, Ghent)