About the Authors

Jeanet Grietje Nieuwenhuis

Roles Conceptualization, Formal analysis, Investigation, Methodology, Writing – original draft

j.nieuwenhuis@ggnet.nl

Affiliation Department VGGNet, Ggnet Mental Hospital, Warnsveld, Netherlands

Peter Lepping

Roles Methodology, Writing – review & editing

Affiliations Betsi Cadwaladr University Health Board, Wrexham, Wales, United Kingdom, Mysore Medical College & Research Institute, Mysuru, India, Department Centre for Mental Health and Society, Wrexham Academic Unit, Wrexham, United Kingdom

Cornelis Lambert Mulder

Roles Conceptualization, Formal analysis, Writing – review & editing

Affiliation Department Psychiatry, Cornelis Lambert Mulder Erasmus University Rotterdam, Rotterdam, Netherlands

Henk Liewellyn Inge Nijman

† Deceased.

Roles Conceptualization, Formal analysis, Writing – review & editing

Affiliations Department Behavioural Science Institute, Radboud University Nijmegen, Nijmegen, Netherlands, Firvoor Forensic Hospital, Den Dolder, The Netherlands

Eric Onno Noorthoorn

Roles Conceptualization, Data curation, Formal analysis, Methodology, Supervision, Writing – original draft

Affiliation Department Research and Development Vordenseweg Ggnet Mental Hospital, Warnsveld, Netherlands

Competing Interests

One of the authors of this article (H. Nijman) is a (co-)author of both the aggression scale (SOAS-R) and the Screener for Intelligence and learning disabilities (SCIL) that were used to collect data in this study. The authors have declared that no competing interests exist. This does not alter our adherence to PLOS ONE policies on sharing data and materials.