| pubmed_trend | R Documentation | 
query pubmed record numbers of search term through years
pubmed_trend(searchTerm, year, verbose = TRUE)
searchTerm | 
 search term  | 
year | 
 year vector  | 
verbose | 
 whether print message  | 
data.frame
guangchuang yu
## Not run: 
pubmed_trend("Yu Guangchuang[Full Author Name]", 2010:2016)
## End(Not run)
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