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Exact(13)
The search generated 868 papers.
The search generated 1311 abstracts, and after applying the inclusion and exclusion criteria, the full text of 17 papers was retrieved.
Across all three databases, the search generated 217 journal articles that made reference to the search terms in their titles and abstracts.
The search generated 58 articles.
The search generated 273 possible references.
The search generated 748 unique citations from across eight databases.
Similar(47)
For the remaining 222 pairs, the literature search generated 17,685 hits.
The English search generated disappointing results; however, the Chinese search found a large number of Web sites about purchasable guns and drugs, one of which even seems to be one of the Web sites described in Mr. Kristof's article!
The initial search generated 33 references (excluding duplicates) for which the titles and abstracts were read to assess if they met inclusion criteria.
The literature search generated a total of 53 publications which met the inclusion criteria (see appendix for their listing and key characteristics).
The initial search generated 86 document references of which 17 met the inclusion criteria.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com