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What do the DOI components mean?

10.1002Prefix indicating the DOI is owned by John Wiley and Sons, Ltd (Publisher of the Cochrane Library)
14651858ISSN of the Cochrane Library
CD001751Cochrane Review ID
Pub3Version number (for versions 2 and up)


Each time a new citation version is published the version number increases by 1, but there is no Pub1. The first version (usually the protocol) has no ‘Pub’ suffix. 

For example, this is the DOI history for a single review looking in the past, present, and future:

https://doi.org/10.1002/14651858.CD008540

2010 protocol
https://doi.org/10.1002/14651858.CD008540.pub22010 first review version
https://doi.org/10.1002/14651858.CD008540.pub3  2012 update
https://doi.org/10.1002/14651858.CD008540.pub4  2016 update
https://doi.org/10.1002/14651858.CD008540.pub5Next citation version when published


For older reviews the earlier versions may not be available in the Cochrane Database of Systematic Reviews (within the Cochrane Library), so a reader will only see the first version of the review with a Wiley DOI. The ‘pub’ number is independent of the stage, type, or status of the review. It just increases by 1 if there’s a new citation version.

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The URL is created by adding the DOI after this: 

https://www.cochranelibrary.com/cdsr/doi/

A /full or /abstract suffix can be used for the full text or abstract, respectively.So  So for the example review, the URL is:

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