1. Research Department of Clinical, Educational and Health Psychology, University College London, London, UK
2. ESRC Centre for Learning and Life Chances in Knowledge Economies and Societies, UCL Institute of Education, London, UK
3. Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro University, Örebro, Sweden
4. Research Department of Epidemiology and Public Health, UCL, London, UK
5. BI: Norwegian Business School, Oslo, Norway