1. School of Psychological Science, University of Bristol, Bristol BS8 1TU, UK
2. MRC Integrative Epidemiology Unit, University of Bristol, Bristol BS8 2BN, UK
3. MRC Biostatistics Unit, University of Cambridge, Cambridge CB2 1TN, UK
4. Centre for Academic Mental Health, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol BS8 2BN, UK