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The present study not only provides up-to-date information on the search engine coverage issue, but also sheds light on the question of whether search engines have changed over time. Methods. First, random samples of websites from each country for each type of site were generated and verified by computer programs. Each of these sites was then manually checked to select only those that were suitable for the study. Next, all four search engines in the study were queried to find out if the engine covered a site and the exact number of pages of the site that were indexed.