Scraping side panel from pubmed in R

https://www.ncbi.nlm.nih.gov/pubmed/?term=APOE+AND+cholesterol

To the right is a box that has "Review(559)" but only when logged into pubmed. I am trying to figure out how to scrape this information.

enter image description here

css: html body#ui-ncbiexternallink-1 div.grid div.col.twelve_col.nomargin.shadow form#EntrezForm div div.supplemental.col.three_col.last div div.filters.app_msg ul.portlet_list li a#EntrezSystem2.PEntrez.PubMed.Pubmed_ResultsPanel.Entrez_Filters.Filter

xpath:

//*[@id="EntrezSystem2.PEntrez.PubMed.Pubmed_ResultsPanel.Entrez_Filters.Filter"]

enter image description here

I tried to use rvest, but run into issues with "xml attributes"