The NHS’s most senior adviser on transgender health refused to share data about his clinic’s patients with the Cass Review.
Dr Hilary Cass said efforts to track the journeys of around 9,000 children who went on to be seen by adult services were “thwarted” by the refusal of clinics to provide evidence.
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Researchers were trying to establish the long-term consequences of medical interventions by seeking data from adult clinics, which take patients from the age of 16.
Six of the seven clinics which run adult gender services refused to comply with the request.
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