1. Department of Adolescent Psychiatry, Faculty of Medicine and Health Technoloy, Vanha Vaasa Hospital, Tampere, Finland;
2. Karolinska Institutet, Stockholm, Sweden;
3. Gender Identity Development Service, Tavistock and Portman NHS Foundation Trust, London, UK;
4. Sexological Clinic, Psychiatric Centre Copenhagen, Copenhagen, Denmark;
5. Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden;
6. Department of Child and Adolescent Psychiatry, Division of Paediatric and Adolescent Medicine, Gender Identity Clinic for Children, Oslo University Hospital, Oslo, Norway;
7. Department of Adolescent Psychiatry, Helsinki University Hospital, Helsinki, Finland