About the Authors

Cassie M. Hazell

Affiliation School of Psychology, University of Sussex, Falmer, Brighton, United Kingdom

Clara Strauss

Affiliations School of Psychology, University of Sussex, Falmer, Brighton, United Kingdom, Research and Development Department, Sussex Partnership NHS Foundation Trust, Sussex Education Centre, Hove, United Kingdom

Kate Cavanagh

Affiliation School of Psychology, University of Sussex, Falmer, Brighton, United Kingdom

Mark Hayward

mih21@sussex.ac.uk

Affiliations School of Psychology, University of Sussex, Falmer, Brighton, United Kingdom, Research and Development Department, Sussex Partnership NHS Foundation Trust, Sussex Education Centre, Hove, United Kingdom

Competing Interests

We confirm that two of the authors (CS & MH) are authors of the self-help book used in Study 1. This does not alter our adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceptualization: CH CS KC MH. Data curation: CH. Formal analysis: CH. Funding acquisition: CH. Investigation: CH. Methodology: CH CS KC MH. Project administration: CH. Supervision: CS KC MH. Validation: CS KC MH. Writing – original draft: CH CS KC MH.