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Context

Methodological context for: Goldberger J (1907). Typhoid "bacillus carriers." In: Rosenau MJ, Lumsden LL, Kastle JH. Report on the origin and prevalence of typhoid fever in the District of Columbia. Hygienic Laboratory, Bulletin No 35, pp 167-174.

Systematic review
Systematic reviews of all the relevant evidence
 
Meta-analysis
Reducing the play of chance using meta-analysis'

Context