128 Chapter 7 in any way, in order to have a random selection of participants. Eight adolescents agreed to participate. Four adolescents could not participate because they had other appointments to attend on the day they visited the clinic and one adolescent declined without giving a reason. All adolescents were interviewed face-to-face. Characteristics of the two groups of adolescents are presented in table 9 (which can be found at page 81). Four parents (three biological mothers and one adoptive mother) of adolescents who had discontinued treatment were asked to participate in the study and all agreed. The other parents were not asked because of logistic reasons. One parent was interviewed face-to-face and three via telephone because of traveling distance. The parents of all interviewed adolescents who continued treatment were asked to participate. Eight parents (seven biological mothers and one biological father) agreed. They were all interviewed face-to-face when their child attended their regular follow-up appointment at the Amsterdam University Medical Centres, location VUmc. All interviews with parents took place between February 2019 and September 2019. In addition, two focus groups with clinicians from the two treatment teams were held. The informants were purposefully selected based on their discipline (all different disciplines working within both teams participated to assure representativeness for the complete treatment team; i.e., three child and adolescent psychiatrists, four child and adolescent psychologists and three paediatric endocrinologists). They had different levels of experience (ranging from one to 12.5 years) with care for transgender minors. Therefore, the participants of the focus groups can be considered representative of the larger group of members across the two teams in terms of the range of disciplines and level of experience. These focus groups took place in June and August 2019. Procedure and measures The interviews were conducted by two authors of this study, both had interview experience (MA and LV). They had not been involved in the diagnostic assessments of the adolescents they interviewed. Initial interview questions were formulated after review of the relevant literature and discussion within the research team involving all authors. The interview guide contained no close ended questions (see Appendix B, which can be found at page 223). Two focus groups were conducted. One of the authors (MV) facilitated both focus groups. During the focus groups the questions asked in the interviews were presented along with several anonymous quotes from the interviews to get the conversation started. The participants were asked whether they agreed and/or identified with the quotes. Furthermore, the participants were invited to express possible other views they held on these topics.