[1] Univ Bristol, MRC Integrat Epidemiol Unit, Ctr Acad Mental Hlth, Bristol, Avon, England
[2] Cardiff Univ, MRC Ctr Neuropsychiat Genet & Genom, Inst Psychol Med & Clin Neurosci, Cardiff, S Glam, Wales
[3] Univ Bristol, Sch Social & Community Med, Bristol, Avon, England
[4] Cardiff Univ, Ctr Acad Mental Hlth, MRC Ctr Neuropsychiat Genet & Genom, Inst Psychol Med & Clin Neurosci, Cardiff, S Glam, Wales