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As a starting point, the publishers have begun to index papers by the federal grant numbers that supported the work.
I also find out which papers later cited my index papers, for example by finding them on Google Scholar.
Once I have a selection of key or index papers for a topic of interest, I pull the relevant papers cited within them.
These are rarely cited compared with the dense network of citations between the index papers and other supportive PMCRC publications.
A total of 344 publications (the 51 index papers and a further 293 cited in them) constitute the citation network.
As an example, the report by Blalock (1944) in the 1944 New England Journal of Medicine is cited by 14 of 51 of the index papers and is the thirteenth most frequent of 334 cited papers.
Similar(52)
There are also methodological issues to be considered if using an index paper to orientate analysis.
For each paper indexed, the database also provides information about the papers in which the index paper has later been cited.
One could argue that using an index paper is comparable to being constrained by a priori concepts.
The decision to use an index paper may rest partly on the number of studies to be synthesised.
Two authors (HO and VS) read each paper and then agreed on the index paper published by Rice and Naksook [ 19] from which the first set of themes were identified.
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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