PT - JOURNAL ARTICLE AU - Moher, David AU - Liberati, Alessandro AU - Tetzlaff, Jennifer AU - Altman, Douglas G TI - Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement AID - 10.1136/bmj.b2535 DP - 2009 Jul 21 TA - BMJ PG - b2535 VI - 339 4099 - http://www.bmj.com/content/339/bmj.b2535.short 4100 - http://www.bmj.com/content/339/bmj.b2535.full SO - BMJ2009 Jul 21; 339