Searches in PubMed can be limited to only display Practice Guidelines. After performing a search in PubMed, click "More..." under Article types in the filters menu, select "Practice Guidelines" from the pop-up list, and click Show. This does not actually filter the list; it only gives you the option to filter on your search results page. To filter the results, click "Practice Guidelines" so it displays in bold. You should now see that your results list is much shorter and restricted to Practice Guidelines only.