To prepare: Choose a simple search term(s) relating to a topic of your PICOT question. Review the information on the evidence hierarchy discussed in Chapter 2 of the course text, in the article, "Facilitating Access to Pre-Processed Research Evidence in Public Health," and in the multimedia presentation "Hierarchy of Evidence Pyramid," found in this week's Learning Resources. Review the information on the Walden Library's website, "Levels of evidence." Take a few minutes to explore the different types of databases available for each level of evidence and focus on the meaning of filtered and non-filtered resources. Conduct a literature search in the Walden Library on your selected topic using the databases that you reviewed. Use at least one database for each of the three levels of filtered information and at least one unfiltered database. Record the number of hits that you find at each level of the hierarchy of evidence. Select one article from the results at each level of the hierarchy. Compare the articles based on the quality and depth of information. What would be the value of each resource if you were determining an evidence-based practice. My PICOT question- In the adult ICU patient, what is the effect of using tooth brush compared to antiseptic oral rinse to decrease VAP.