AOP INFORMATION PAGE

What is AOP?
Is the AOP version of the article definitive?
What is a Digital Object Identifier?
What do the numbers in the DOI signify?
Can I use the DOI in a reference citation?
How can I use a DOI to find a paper?
What is the official publication date?
Must I subscribe to the journal in order to read AOP articles?
Does Medline use DOIs?
Does ISI use DOIs?
How does AOP affect calculation of impact factors?
What are page numbers that appear in PDFs of AOP papers?

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What is AOP?

AOP stands for "advance online publication." The American Journal of Gastroenterology website includes an AOP table of contents, in which papers are listed in order of publication date (beginning with the most recent). Each paper carries a digital object identifier (DOI), which serves as a unique electronic identification tag for that paper. As soon as the monthly issue is printed, papers will be removed from the AOP table of contents, assigned a page number and transferred to that issue's table of contents on the website. The DOI remains attached to the paper to provide a persistent identifier. We believe that rapid online publication is a valuable service to both readers and contributors, and we encourage you to visit our site often.

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Is the AOP version of the article definitive?

Yes. Different publishers have different policies and some journals publish unedited or partly edited versions of articles on their web sites, before publishing them in print. Springer Nature's policy, however, is to publish online only the final version of the paper, exactly as it will be published in the printed edition. The paper is thus complete in every respect except that instead of having a volume/issue/page number, it has a DOI (Digital Object Identifier). This means that the paper can be referenced as soon as it appears on the AOP site by using the DOI.

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What is a Digital Object Identifier?

A digital object identifier (DOI) is an international, public, "persistent identifier of intellectual property entities" in the form of a combination of numbers and letters. For Springer Nature content the DOI is assigned to an item of editorial content, providing a unique and persistent identifier for that item. The DOI system is administered by the International DOI Foundation, a not-for-profit organization. CrossRef, a not-for-profit organization, makes the DOI a reference linking standard and enables cross-publisher linking. It also maintains the lookup system for DOIs. Springer Nature is a founding, and board, member of CrossRef.

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What do the numbers in the DOI signify?

The DOI has two components, a prefix (before the slash) and a suffix (after the slash). The prefix is a DOI resolver server identifier (10) and a unique identifier assigned to the publisher-for example, the identifier for Springer Nature is 1038 and the entire DOI prefix for an article published by Springer Nature is 10.1038. The suffix is an arbitrary number provided by the publisher; it can be composed of numbers and/or letters and does not necessarily have any systematic significance. Each DOI is registered in a central resolution database that associates it with one or more corresponding web locations (URLs). For example, the doi:10.1038/sj.ajg.5700001 connects to http://dx.doi.org/10.1038/sj.ajg.5700001.

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Can I use the DOI in a reference citation?

Yes. Instead of giving the volume and page number, you can give the paper's DOI at the end of the citation. For example, American Journal of Gastroenterology papers should be cited in the form;
Author(s) The American Journal of Gastroenterology advance online publication, day month year (DOI 10.1038/sj.ajg.XXXXXXX).

After print publication, you should give the DOI as well as the print citation to enable readers to find the paper in print as well as online. For example;
Author(s) (Year) Article American Journal of Gastroenterology volume, page(s); advance online publication, day month year (DOI 10.1038/sj.ajg.XXXXXXX).

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How can I use a DOI to find a paper?

There are two ways to use a DOI to find a paper:

  1. DOIs from other articles can be embedded into the linking coding of an article's reference section. In Springer Nature journals these appear as "|Article|" in the reference sections. When |Article| is clicked upon it opens another browser window leading to the entrance page (often the abstract) for another article. Depending on the source of the article, this page can be on the Springer Nature site or the site of another publisher. This service is enabled by CrossRef.
  2. A DOI can be inserted directly into the browser's location bar. For example, for the doi:10.1038/sj.ajg.6100001, typing http://dx.doi.org/10.1038/sj.ajg.6100001 brings up the entrance page of the article.
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What is the official publication date?

Many journals, including most abstracting and indexing services (including Medline and ISI), cite the print date as the publication date. This is an evolving standard, however, and publishers are increasingly stating both the 'online publication date' and the 'print publication date'. Springer Nature will continue to publish both dates for our own papers, and we hope that the scientific communities and abstracting and indexing services will recognize these dates. We will endeavour to include both the online publication date and the usual print citation in reference lists of Springer Nature papers, where a paper has been published online before being published in print. Given the utility of the DOI in locating an online publication in the future, we encourage you to use DOIs in your reference citations (see "Can I use the DOI in a reference citation?").
For legal purposes (for example, establishing intellectual property rights), we assume that online publication constitutes public disclosure. But this is for the courts to decide; Springer Nature's role as a publisher is to provide clear documentation of the publication history, both online and in print.

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Must I subscribe to the journal in order to read AOP articles?

Yes. AOP papers are the same as those in the print issues: while abstracts are freely available on any Springer Nature journal's website, access to the full-text article requires a paid subscription or a site license.

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Does Medline use DOIs?

Medline currently captures DOIs with online publication dates in its records and is developing an enhanced level of support for the DOI system.

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Does The Institute for Scientific Information use DOIs?

ISI (Institute for Scientific Information) currently captures DOIs in its records at the same time as the volume/issue/page number. Therefore, ISI is not using the DOI to capture information before print publication, but rather as an additional piece of metadata.

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How does AOP affect the calculation of impact factors?

Impact factors are calculated by ISI. At present, ISI bases its calculations on the date of print publication alone, so until or unless ISI changes its policy, AOP has no effect on impact factors.
See the ISI site for a full explanation of how impact factors are calculated.

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What are the page numbers that appear in PDFs of AOP papers?

For convenience, the PDF version of every AOP article is given a temporary pagination, beginning with page 1. This is unrelated to the final pagination in the printed article.


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