![]() If you use a search tag and the phrase is not found in the phrase index, the phrase will be broken into separate terms, e.g., "psittacine flight" is not in the phrase index, so a search for psittacine flight is broken up and translated as: ((("psittaciformes" OR "psittaciformes") OR "psittacine") OR "psittacines") AND "flight".If you use quotes and the phrase is not found in the phrase index, the quotes are ignored and the terms are processed using automatic term mapping.Enclose the phrase in double quotes: "kidney allograft".You can bypass ATM and search for a specific phrase using the following formats: For example, if you enter fever of unknown origin, PubMed recognizes this phrase as a MeSH Term. However, many phrases are recognized by the subject translation table used in PubMed' s Automatic Term Mapping (ATM). PubMed does not perform adjacency searching. Boolean operators must be used when combining tagged search terms as follows: search term BOOLEAN OPERATOR search term. Use parentheses to “nest” concepts that should be processed as a unit and then incorporated into the overall search. PubMed processes searches in a left-to-right sequence. NOT excludes the retrieval of terms from your search.OR retrieves results that include at least one of the search terms.AND retrieves results that include all the search terms.Enter Boolean operators in uppercase characters to combine or exclude search terms: PubMed applies an AND operator between concepts, e.g., “vitamin c common cold” is translated as vitamin c AND common cold. Enter the terms (or key concepts) in the search box.Ĭombining search terms with Boolean operators (AND, OR, NOT).Identify the key concepts for your search. ![]()
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