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Hi,
When you are off-campus it is important to always open PubMed from a library link so that you can see the Find @ UNC button.
http://www.ncbi.nlm.nih.gov/pubmed?otool=uncchlib&term=21275904[uid]&cmd=DetailsSearch
The first time you click the Find @ UNC button in a session it will send you to the page to sign in with your Onyen and Password. Then it will take you to a page with a link to the article.
This article opens for me from this page. Let me know if you are still having problems.