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Article Source: Is Patent “Evergreening” Restricting Access to Medicine/Device Combination Products?
Beall RF, Nickerson JW, Kaplan WA, Attaran A (2016) Is Patent “Evergreening” Restricting Access to Medicine/Device Combination Products?. PLOS ONE 11(2): e0148939. https://doi.org/10.1371/journal.pone.0148939

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