What purpose does a review of the literature serve for a quantitative research study

For for the following article, please assist me by answering the following questions:

I. Article citation and questions:

Segre, L. (2011). Incorporating mental healthcare into routine postpartum nursing is a promising approach for reducing depression in new mothers. Evidence-based Nurse: 14 (92-93). Retrieved from http://ebn.bmj.com/content/14/3/92.extract

2.    Write a bullet point outline (paraphrased) of the main themes or points the authors discussed in their literature review. (e.g., “Emotional intimacy has been shown to influence relationship satisfaction; Self-disclosure is important for couple’s emotional intimacy…”)

3.    What purpose does a review of the literature serve for a quantitative research study (Remember this question is not about this study, it’s about quantitative research studies in general)?

4.    Given the purpose of a literature review for quantitative research you described above, did the authors do a good job with this? Why or why not?

5.    Describe the methods used in this study. Include which quantitative approach was used (e.g., cross-sectional survey, longitudinal survey, quasi-experimental, experimental), what sampling strategy was used, who the participants were [number, age, gender, race/ethnicity], and how the author(s) operationalized their variables of interest (In other words, what measures did they use to assess which variables [“The researchers used the Beck Depression Inventory-II to assess depression…”).

6.    What kinds of research questions are the methods employed in this study typically used to answer? This questions refers to research studies in general (not this study specifically); why might a researcher choose this design/approach (the approach you identified in #5)?

7.    What are the implications of the sampling method on the external validity of the study (does the way the selected their sample and the participants they ended up with compromise to whom the results of the study will apply?)?

8.    Are there any threats to internal validity that the researchers did a good job of addressing or that they did not address well (in other words—are there alternate explanations that fit the results better than the ones the author(s) provided)? Provide support for your response.

9.    What was the goal of the statistical analysis in this study? Was it to describe frequency and averages, to explore relationships among variables or to test for differences between groups? Provide support for your response.

10.    Considering the methods used in this study, including the sampling procedures, operationalization of the variables of interest and the statistical tests used, did the researchers draw reasonable conclusions based on the results? (In other words, have their conclusions gone beyond the data they have in hand?)

11.    What are the real world implications of the study findings? Are the results meaningful and important for clinical practice?  To whom might these results apply?