You Are Reading a Paper in the Journal Vaccine That

Multiple Choice

You are reading a paper in the journal Vaccine that analyzed and combined the results from five observational studies involving over one million children and another five studies that compared children with autism to children without autism (a total of nearly 10,000 children) .The paper you are reading is best recognized as a

A) secondary literature source.
B) meta-analysis and primary literature source.
C) cohort study.
D) case-control study.