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indexSearching the Identifying Codes FieldEnter Identifying Codes to search the following fields within a record:
Enter one or more codes connected with search operators (AND, OR, NOT). Enter complete codes or partial codes using wildcards. indexLeft- and Right-hand TruncationBoth left- and right-hand truncation are allowed when using wildcards (* $ ?) when searching for Identifying Codes. You must enter at least one characters after a wildcard when used at the beginning of a word. indexIdentifying Codes Examples
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indexISSNThe International Standard Serial Number is a unique eight-digit number that identifies periodical publications such as journals and electronic publications. If a journal has both a print ISSN and an electronic ISSN, then both display. The format is four numbers, a hyphen (-), three numbers, and then a check character that may be a number or X. Example: 1367-4803 indexPubMed ID and NLM Unique IDThe difference between the PubMed ID and the NLM Unique ID is that the PubMed ID is a unique identifier for the record. The NLM Unique ID is a unique identifier for the source journal. Searching by NLM Unique ID is like searching by ISSN. |