I fear Prof Simonoff is showing some bias here
"The new study is being led by Professor Emily Simonoff, head of child and adolescent psychiatry at King’s College London, who said the UK is “taking the bull by the horns” and helping to build an evidence-base on important questions about gender care.
"A lack of evidence base allows toxic views [about transgender issues] to be more rampant and more free flowing. We’re here to provide an evidence base to guide greater knowledge about outcomes for children and young people and what interventions seem to be most helpful for them,” said Simonoff
"
https://www.thetimes.com/article/711e767a-ef32-4c60-a7f5-f1092ab15f66?shareToken=84c2203a6bd8b4f6090bfcb7ea3bd533