A Canadian health provider said it couldn’t participate, citing recent threats to hospitals offering youth gender care. But as Reuters found, hard evidence on long-term outcomes for the rising numbers of people who received gender treatment as minors is very weak. Dr Marianne van der Loos, the Dutch study’s lead author, is a physician at Amsterdam University Medical Center’s Center for Expertise on Gender Dysphoria, a pioneer in gender care for adolescents. For those who also received medical treatment, detransitioning typically includes halting the hormone therapy they otherwise would receive for years. One is Max Robinson, who was 16 when she sought gender care at Kaiser in 2012.

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