to maximize the efficiency of the review; identifying subject headings and key words for electronic searches; identifying the most appropriate databases; including supplementing computer and Web-based searches; identifying and dealing with unpublished studies; setting inclusion and exclusion criteria; justifying methods for reviewing only the `highest quality? literature; preparing a structured literature abstraction form; ensuring the reliability and validity of the review; synthesizing and reporting results; conducting and evaluating descriptive literature reviews; and, how to understand and evaluate the principles of meta-analysis.

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