It is always worth trying a quick Google search to see if the article is freely available. Find @ UNC is not able to point to all of those and we are consistently surprised by what we find freely available online.
Find @ UNC
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On Campus Access: Electronic resources are accessible on-campus. Faculty, students and staff must register personal laptops and mobile devices with UNC Chapel Hill ITS.
UNC Hospitals Access: Always use links from Library websites. Onyen log-in is required when you select the first resource. Note: UpToDate is available within EPIC.
Off Campus Access: Always use links from Library websites. Onyen log-in is required when you select the first resource. Most electronic resources are accessible off-campus to students, faculty, and staff, including UNC Hospitals' staff.