[1] McMaster Univ, Fac Hlth Sci, Dept Clin Epidemiol & Biostat, Hamilton, ON, Canada
[2] Univ Hosp Geneva, Div Clin Epidemiol, Div Gen Internal Med, Geneva, Switzerland
[3] Innlandet Hosp Trust, Dept Med, Gjovik, Norway
[4] Univ Oslo, Fac Med, Inst Hlth & Soc, Oslo, Norway
[5] Biomed Res Inst St Pau CIBER Epidemiol & Salud Pu, Iberoamer Cochrane Ctr, Barcelona, Spain
[6] Amer Univ Beirut, Dept Internal Med, Beirut, Lebanon
[7] Pontificia Univ Catolica Chile, Sch Med, Dept Internal Med, Santiago, Chile
[8] Univ Helsinki, Cent Hosp, Dept Urol, Helsinki, Finland
[9] Univ Helsinki, Cent Hosp, Dept Publ Hlth, Helsinki, Finland
[10] Univ Helsinki, Helsinki, Finland
[11] Maastricht Univ, Sch Publ Hlth & Primary Care, Dept Family Med, NL-6200 MD Maastricht, Netherlands
[12] Dartmouth Inst Hlth Policy & Clin Practice, Dartmouth Ctr Hlth Care Delivery Sci, Hanover, NH USA
[13] Mayo Clin, Knowledge & Evaluat Res Unit, Rochester, MN USA