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Judi Kidger, Rhiannon Evans, Sarah Bell, Harriet Fisher, Nicholas Turner, William Hollingworth, Sarah Harding, Jillian Powell, Rowan Brockman, Lauren Copeland, Ricardo Araya, Rona Campbell, Tamsin Ford, David Gunnell, Richard Morris & Simon Murphy.

Judi Kidger ^1,*, Rhiannon Evans ², Sarah Bell ¹, Harriet Fisher ¹, Nicholas Turner ^1,3, William Hollingworth ¹, Sarah Harding ⁴, Jillian Powell ⁴, Rowan Brockman ¹, Lauren Copeland ², Ricardo Araya ⁵, Rona Campbell ¹, Tamsin Ford ⁶, David Gunnell ¹, Richard Morris ¹, Simon Murphy ²

¹ Population Health Sciences, University of Bristol, Bristol, UK
² Centre for Development, Evaluation, Complexity and Implementation in Public Health Improvement (DECIPHer), School of Social Sciences, Cardiff University, Cardiff, UK
³ Bristol Randomised Trials Unit, University of Bristol, Bristol, UK
⁴ School for Policy Studies, University of Bristol, Bristol, UK
⁵ Centre for Population Neuroscience and Precision Medicine, King’s College London, London, UK
⁶ Department of Psychiatry, University of Cambridge, Cambridge, UK
^* Corresponding author Email: judi.kidger@bristol.ac.uk

Declared competing interests of authors: William Hollingworth reports membership of the National Institute for Health Research (NIHR) Health Technology Assessment Clinical Evaluation and Trials Funding Committee (2016 to present). Rona Campbell reports membership of the NIHR Public Health Research Funding Board (2015 to present). Tamsin Ford chairs the Research Advisory Group (unpaid except travel expenses) and has received funding to support junior academics in collaborations with the research team at Place2Be (London, UK). The latter is a charity that provides counselling to children in schools and collects outcome data on which Tamsin Ford and her staff have worked. The interventions provided by Place2Be are not related to or affected by the application of mental health first aid and are of no relevance to the Wellbeing in Secondary Education trial.