They search primarily on clinically related sites. The searcher can browse through the hierarchical MeSH results or can search directly. Included are links to search the National Library of Medicine s PubMed database using the appropriate MeSH terms. HON is the founding site of the HONcode for ethical development of health information Web sites. Medical World Search searches selected sites using a powerful thesaurus capability that minimizes the variability of medical terminology.
Searchers are able to refine search results and to query other search engines.
Thousands of links to full-text resources are provided. Additional resources include searchable drug information and a dictionary. Optional registration provides several additional search features. Some of the most popular general search engines are listed below. They can provide very broad, unfiltered retrieval on health-related topics.