Suggested answer for Exercise 2
(Click the Steps to run the demonstration.)

Exercise 2 -- Advanced
Find citations to articles about whooping cough written in English and published in the last year. Link to publishers' web sites for the full-text for a few of the articles. See what is available for free or for fee. Use the LinkOut feature to find more information about whooping cough in NLM's MedlinePlus. See the Related Articles for one or two of the items retrieved.

This is a suggested answer. Your approach, as well as the number of results retrieved, may vary. New citations are added regularly to PubMed.

• Step 1: Enter your term (whooping cough) in the PubMed query box.
  
  
• Step 2: Click on Limits. Use the Published in the Last pull-down to select 1 year. Use the Languages menu to select English.
  
  
• Step 3: Click the Go button. PubMed retrieves the items and displays them in Summary display format, 20 per page. Notice the limits applied to the search are shown in yellow above the results (i.e., Limits: English, published in the last 1 year).
  
  
• Step 4: Use the Display pull-down to select Citation (or Abstract, or AbstractPlus) display format. Review the first 20 items noticing that some of the citations have publisher icons that are links to the full text of the article. Click on a few of the publisher icons to link to their web sites. Do these sites require a subscription or license or are they free? Be aware that some sites may only provide the abstract for free.
  
  
• Step 5: Go Back to the PubMed results screen. Click the Links link for a "PubMed - indexed for MEDLINE" citation. Click on LinkOut. Find the link to Whooping Cough information in NLM's MedlinePlus.
  
  
• Step 6: Go Back to the PubMed results screen. Review the first 20 items. Select one citation of interest to you. Use the Related Articles link to see similar articles in the PubMed database.