About the Authors

Megan R. Stafford

Affiliation National Collaborating Centre for Mental Health (NCCMH), Royal College of Psychiatrists, London, United Kingdom

Evan Mayo-Wilson

Affiliation Centre for Outcomes, Research & Effectiveness (CORE), University College London, London, United Kingdom

Christina E. Loucas

Affiliation National Collaborating Centre for Mental Health (NCCMH), Royal College of Psychiatrists, London, United Kingdom

Anthony James

Affiliation Highfield Adolescent Unit, Warneford Hospital, Oxford, United Kingdom

Chris Hollis

Affiliation Faculty of Medicine & Health Sciences, Queen’s Medical Centre, Nottingham, United Kingdom

Max Birchwood

Affiliation Division of Mental Health and Wellbeing, Warwick Medical School, University of Warwick, Coventry, United Kingdom

Tim Kendall

tim2.kendall@virgin.net

Affiliation National Collaborating Centre for Mental Health (NCCMH), Royal College of Psychiatrists, London, United Kingdom

Competing Interests

This work was supported by the National Collaborating Centre for Mental Health and conducted as part of a guideline about psychosis in children, adolescents and young adults. The full review protocol is available from the authors. All authors contributed to the 23 development of the review questions. MRS drafted the review protocol. Sarah Stockton, of the National Collaborating Centre for Mental Health, designed and implemented the searches. MRS, EMW and CEL assessed the eligibility of the studies for inclusion and extracted data. MRS and EMW assessed risk of bias and applied GRADE criteria. The authors would like to acknowledge the support of Hannah Jackson, who worked at the National Collaborating Centre for Mental Health as a research assistant, during guideline development. All authors contributed to the analyses, the writing of the manuscript and agreed on the final draft. All authors had full access to the data (including statistical results and tables) and take responsibility for the integrity of the data and accuracy of the analysis. This does not alter the authors’ adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: MRS EMW CEL AJ CH MB TK. Performed the experiments: MRS EMW CEL. Analyzed the data: MRS EMW CEL AJ CH MB TK. Contributed reagents/materials/analysis tools: MRS EMW CEL AJ CH MB TK. Wrote the paper: MRS EMW CEL AJ CH MB TK. Development of the review questions: MRS EMW CEL AJ CH MB TK. Drafted the review protocol: MRS. Assessed the eligibility of the studies for inclusion and extracted data: MRS EMW CEL. Assessed risk of bias and applied GRADE criteria: MRS EMW.