About the Authors

Sally Hartley

Affiliations Faculty of Medicine and Health Sciences, University of East Anglia, Norwich, United Kingdom, Faculty of Health Sciences, University of Sydney, Sydney, New South Wales, Australia, The London School of Hygiene and Tropical Medicine, London, United Kingdom

Maggie McArthur

Affiliation Faculty of Medicine and Health Sciences, University of East Anglia, Norwich, United Kingdom

Michaela Coenen

Affiliation Department of Medical Informatics, Biometry and Epidemiology – IBE, Chair for Public Health and Health Services Research, Research Unit for Biopsychosocial Health, Ludwig-Maximilians-University (LMU), Munich, Germany

Maria Cabello

Affiliation Instituto de Salud Carlos lll CIBERSAM, Faculty of Medicine, Universidad Autonoma de Madrid, Instituto de investigacion de la Princesa (IIS-IP), Madrid, Spain

Venusia Covelli

Affiliation Neurology, Public Health and Disability Unit, Scientific Directorate, Neurological Institute Carlo Besta IRCCS Foundation, Milan, Italy

Joanna Roszczynska-Michta

Affiliation Institute of Neurology and Psychiatry, Warsaw, Poland

Tuuli Pitkänen

Affiliation A-Clinic Foundation (A-klinikkasäätiö), Helsinki, Finland

Jerome Bickenbach

Affiliation Swiss Paraplegic Research (SPR), Nottwil, Switzerland

Alarcos Cieza

alarcos.cieza@soton.ac.uk

Affiliations Department of Medical Informatics, Biometry and Epidemiology – IBE, Chair for Public Health and Health Services Research, Research Unit for Biopsychosocial Health, Ludwig-Maximilians-University (LMU), Munich, Germany, Swiss Paraplegic Research (SPR), Nottwil, Switzerland, Faculty of Social and Human Sciences, University of Southampton, Southampton, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SH JB AC. Performed the experiments: MM M. Coenen M. Cabello VC JRM TP. Analyzed the data: SH MM M. Coenen M. Cabello VC JRM TP. Wrote the paper: SH AC.