Data sources
We used the Web of Science Core Collection (WoS, by Clarivate Analytics)
to collect all studies that cited the index study. WoS is commonly used
for bibliometric
analyses,14and we chose this database over alternatives such as Scopus and Google
Scholar because of the availability of detailed citation metadata such
as research areas, article type, funding agencies, and countries of
origin. We conducted a search in June 2019 and then an update in July
2020 covering the period from the publication of the index study through
to the end of 2019. The citation information for every article was
collected into EndNote (by Clarivate Analytics), which was used to
retrieve full text records. The remaining full text records were
retrieved manually. We examined all the retrieved full text articles to
ensure that the index study was indeed cited. Metadata collected from
WoS were collected and managed using Microsoft Excel (by Microsoft).