[BioC] paper - download - pubmed

[Nooshin Omranian]

Hi,

I actually need to download pdfs through R code. The thing which I want 
to do is that, search for a paper in pubmed, which is possible by using 
GetPubMed function in the package "NCBI2R’".

GetPubMed(searchterm, file = "", download = TRUE , showurl = FALSE, xldiv =
";", hyper = "HYPERLINK", MaxRet = 30000, sme = FALSE, smt = FALSE,
quiet = TRUE, batchsize=500,descHead=FALSE)

With this function I can not download the pdfs for all hits, although if 
I go to the pubmed, I can download it.

So, the problem is not that, for each paper I have to download the pdfs 
(which are available if I go to the pubmed and search directly there) 
and the corresponding supplementary files.

Could anybody please help me how I can solve this?

Thanks,
Nooshin