1. Department of Psychology and Sport Sciences, University of Hertfordshire, Herts AL, UK
2. Centre for Research in Public Health and Community Care, University of Hertfordshire, College Lane, Hatfield, Herts AL, UK
3. Institute for Sport and Physical Activity Research (ISPAR), School of Sport Science and Physical Activity, Faculty of Education and Sport, University of Bedfordshire, Bedford, UK
4. UCL School of Pharmacy, Centre for Behavioural Medicine, Research Department of Practice and Policy, University College London, London, UK