[1] Univ Paris, Dept Pediat, Paris, France
[2] Univ Paris, Necker Enfants Malad Hosp, AP HP, Ctr Res Epidemiol & Stat,INSERM,UMR 1153, Paris, France
[3] Univ Birmingham, Inst Appl Hlth Res, Birmingham, W Midlands, England
[4] Univ Hosp Birmingham NHS Fdn Trust, NIHR Birmingham Biomed Res Ctr, Birmingham, W Midlands, England
[5] Univ Birmingham, Birmingham, W Midlands, England
[6] Univ Utrecht, Univ Med Ctr Utrecht, Julius Ctr Hlth Sci & Primary Care, Cochrane Netherlands, Utrecht, Netherlands
[7] Ottawa Hosp Res Inst, Clin Epidemiol Program, Ottawa, ON, Canada
[8] Queens Univ, Fac Med, Kingston, ON, Canada
[9] Acad Med Ctr, Dept Resp Med, Amsterdam, Netherlands
[10] Brown Univ, Providence, RI 02912 USA
[11] Univ Oxford, Ctr Stat Med, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Oxford, England
[12] Univ Exeter, Coll Med & Hlth, Exeter Test Grp, Exeter, Devon, England
[13] Acad Med Ctr, Amsterdam Publ Hlth, Dept Clin Epidemiol Biostat & Bioinformat, Amsterdam, Netherlands
[14] Univ Sydney, Sydney, NSW, Australia
[15] Univ Ottawa, Dept Radiol, Ottawa, ON, Canada
[16] Ottawa Hosp Res Inst, Ctr Journalol, Clin Epidemiol Program, Ottawa, ON, Canada
[17] Univ Bern, Inst Social & Prevent Med, Bern, Switzerland
[18] Univ Calgary, Dept Med, Calgary, AB, Canada
[19] Univ Bristol, Bristol Med Sch, Populat Hlth Sci, Bristol, Avon, England
[20] McGill Univ, Lady Davis Inst, Jewish Gen Hosp, Montreal, PQ, Canada
[21] McGill Univ, Dept Psychiat, Montreal, PQ, Canada
[22] Univ Ottawa, Clin Epidemiol Program, Ottawa Hosp Res Inst, Ottawa, ON, Canada