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She has worked on numerous projects supporting providers of services to improve outcomes for children and families through better use of evidence in the design, delivery and evaluation of these services. GW is a Research Manager at Autistica. Prior to this she was a Postdoctoral Research Fellow at the Dartington Social Research Unit, during which time she worked on the trial. GB is a Postdoctoral Research Associate at the Peninsula Cerebra Research Unit, University of Exeter Medical School. Prior to this she was a Research Fellow at Dartington Social Research Unit. She has experience of working on several RCTs and systematic reviews of interventions for children. She is also an Associate of the Dartington Service Design Lab. TH is Director of the Dartington Service Design Lab and was previously a Senior Researcher and Head of Data and Analytics at the Dartington Social Research Unit. He leads Dartington\u2019s work on the Realising Ambition programme of work, focused on preventing children and young people from entering the criminal justice system. LB is a Psychological Wellbeing Practitioner within Devon Partnership NHS Trust. Prior to this she was a Researcher at Dartington Social Research Unit. ZW is a PhD student in the School of Social Sciences, Cardiff University. Prior to this she was a Researcher at Dartington Social Research Unit. VB is a Senior Research Fellow for NIHR CLAHRC South West Peninsula (PenCLAHRC). Prior to this she was a Senior Researcher at the Dartington Social Research Unit. Her area of expertise is children\u2019s mental health, parenting and domestic abuse. OU is an Associate Professor in Medical Statistics in NIHR CLAHRC South West Peninsula (PenCLAHRC), University of Exeter Medical School. His area of expertise is the analysis of data from cluster randomised trials. JM is a Research Fellow in NIHR CLAHRC South West Peninsula (PenCLAHRC), University of Exeter Medical School. He provides statistical support to a range of PenCLAHRC projects. RT is Professor of Health Services Research based in the University of Exeter Medical School. He is currently Academic lead for the Exeter Clinical Trials Support Network and has expertise in medical statistics and clinical trial design, in particular the design and analysis of clinical trials of complex interventions. TE is a Senior Medical Research Analyst Programmer for the Exeter Clinical Trials Unit and (NIHR) Clinical Research Facility at the University of Exeter Medical School. AK is a Senior Lecturer in the School of Education, University of Roehampton. She was previously a Research Fellow at the Dartington Social Research Unit and, before that, a Postdoctoral Researcher at the Institute of Psychiatry, King\u2019s College London. SB is a Research Fellow in the Department of Health Sciences at the University of York. She has experience in facilitating service design, providing support to those implementing evidence-based programmes and mixed-methods evaluation. She previously worked at the Dartington Social Research Unit. NA is a PenCLAHRC Associate Professor in Health Services Research in the Plymouth University Peninsula Schools of Medicine and Dentistry and a Senior Associate of the Dartington Service Design Lab. Prior to this he was a Senior Researcher at the Dartington Social Research Unit. His research focuses on prevention and early intervention in children\u2019s services.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Authors\u2019 information"}},{"value":"The study was approved by the Warren House Group Research Ethics Committee (ref. WHG2014\u2013001) (4th July 2014). Any proposed changes to the protocol will be communicated to the Ethics Committee and approval will be sought before proceeding.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}},{"value":"Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Publisher\u2019s Note"}}],"article-number":"9"}}