[1] Agencia Qualitat & Avaluacio Sanitaries AQuAS, Barcelona 08005, Spain
[2] Fdn Inst Mar Invest Med IMIM, Barcelona 08003, Spain
[3] CIBER Epidemiol & Salud Publ, Madrid 28029, Spain
[4] Univ Nottingham, Sch Med, Derbyshire Childrens Hosp, Acad Div Child Hlth, Derby DE22 3DT, England
[5] Linkoping Univ, Dept Med & Hlth Sci, Div Community Med, S-58185 Linkoping, Sweden
[6] Stockholm Univ, Karolinska Inst, Ctr Hlth Equ Studies CHESS, S-10691 Stockholm, Sweden
[7] Univ Alberta, Dept Pediat, Edmonton, AB, Canada
[8] Univ Bristol, Sch Policy Studies, Bristol BS8 1TZ, Avon, England
[9] Erasmus Univ, Med Ctr, Dept Publ Hlth, NL-3000 CA Rotterdam, Netherlands
[10] Univ Montreal, Dept Social & Prevent Med, Montreal, PQ H3C 3J7, Canada
[11] Univ Warwick, Warwick Med Sch, Div Mental Hlth & Wellbeing, Coventry CV4 7AL, W Midlands, England
[12] Univ Liverpool, Dept Publ Hlth & Policy, Liverpool L69 3GB, Merseyside, England