## Not run:
# ## Find related articles to PMID 20210808 and xtract linked UIDs from the
# ## "pubmed" to "pubmed_reviews" link
# x <- elink("20210808", dbFrom = "pubmed", dbTo = "pubmed", cmd = "neighbor_score")
# linkset(x, "pubmed_pubmed_reviews")
# ## End(Not run)
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