[1] Univ Bristol, Ctr Acad Mental Hlth, Med Sch, Bristol, England
[2] Univ Bristol, Populat Hlth Sci, Med Sch, Canynge Hall,39 Whatley Rd, Bristol BS8 2PS, England
[3] Univ Bristol, Med Res Council Integrat Epidemiol Unit, Bristol, England
[4] Gloucestershire Hlth & Care Natl Hlth Serv Fdn Tru, Gloucester, England
[5] Univ Bristol, Sch Educ, Bristol, England
[6] Univ Bristol, Bristol Univ Med Sch, Bristol, England
[7] Univ Hosp Bristol & Weston Natl Hlth Serv Fdn Trus, Natl Inst Hlth Res Appl Res Collaborat West, Bristol, England
[8] Univ Hosp Bristol & Weston Natl Hlth Serv Fdn Trus, Biomed Res Ctr, Bristol, England