[1] Monash Univ, Cochrane Australia, Sch Publ Hlth & Prevent Med, 4th Floor,553 St Kilda Rd, Melbourne, Vic 3004, Australia
[2] Monash Univ, Dept Infect Dis, 53 Commercial Rd, Melbourne, Vic 3004, Australia
[3] Alfred Hosp, 53 Commercial Rd, Melbourne, Vic 3004, Australia
[4] La Trobe Univ, Sch Psychol & Publ Hlth, Hlth Sci 2, Ctr Hlth Commun & Participat, Level 4,Sci Dr, Bundoora, Vic 3086, Australia
[5] Univ York, Alcuin Coll, Ctr Reviews & Disseminat, A-B Block, York YO10 5DD, N Yorkshire, England
[6] Amer Univ Beirut, Dept Internal Med, Off Gefinor Ctr Block B, Beirut, Lebanon
[7] Amer Univ Beirut, Dept Epidemiol & Populat Hlth, Off Gefinor Ctr Block B, Beirut, Lebanon
[8] McMaster Univ, Dept Hlth Res Methods Evidence & Impact, 1280 Main St West, Hamilton, ON L8S 4K1, Canada
[9] Univ Bern, Inst Social & Prevent Med, Finkenhubelweg 11, CH-3012 Bern, Switzerland
[10] Univ Freiburg, Cochrane Germany, Med Ctr, Breisacher Str 153, D-79110 Freiburg, Germany
[11] Cochrane, Cochrane Editorial Unit, St Albans House,57-59 Haymarket, London SW1Y 4QX, England
[12] UCL, Inst Educ, EPPI Ctr, 18 Woburn Sq, London WC1H 0NR, England