Cochrane systematic reviews: time for an introduction and appraisal.
Ling
Walter
W
Farrell
Michael
M
Ali
Robert
R
D003299:Cooperative Behavior; D003625:Data Collection; D006801:Humans; D007391:International Cooperation; D015201:Meta-Analysis as Topic; D016032:Randomized Controlled Trials as Topic; D012196:Review Literature as Topic; D019966:Substance-Related Disorders