A literature review, like most academic papers, must also contain at least three basic elements: an introduction or background information section; the body of the review containing the discussion of sources; and, finally, a conclusion and/or recommendations section to end the paper.
Introduction: Gives a quick idea of the topic of the literature review (Asthma Prevalence In/Among -----?), and must present the central theme or organizational pattern.
Body: Contains your discussion of sources and is organized either chronologically, thematically, or methodologically (e.g. adhere to APA formatting requirements).
Conclusions/Recommendations: Discuss what you have drawn from reviewing literature so far. Where might the discussion proceed?