[1] Univ Birmingham, Dept Primary Care & Gen Practice, Birmingham, W Midlands, England
[2] Univ Birmingham, Dept Psychiat, Birmingham, W Midlands, England
[3] Queen Elizabeth Psychiat Hosp, Mother & Baby Psychiat Unit, Birmingham, W Midlands, England
[4] Univ Rochester, Med Ctr, Dept Psychiat, Lab Prevent Mental Disorders, New Rochelle, NY USA
[5] Cardiff Univ, Dept Psychol Med, Cardiff, S Glam, Wales