Long-term outcomes of psychological interventions on children and young people's mental health: A systematic review and meta-analysis. by Stephen Pilling, Peter Fonagy, Elizabeth Allison, Phoebe Barnett, Chloe Campbell, Matthew Constantinou, Tessa Gardner, Nicolas Lorenzini, Hannah Matthews, Alana Ryan, Sofia Sacchetti, Alexandra Truscott, Tamara Ventura, Kate Watchorn, Craig Whittington, Tim Kendall

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