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Free full text from BORIS free resource Bern Open Repository and Information System https://boris.unibe.ch/id/eprint/13952
HIV Medicines free resource MedlinePlus Health Information https://medlineplus.gov/hivmedicines.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22987878/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/22987878
subscription/membership/fee required Silverchair Information Systems https://publications.aap.org/pediatrics/article-lookup/doi/10.1542/peds.2011-3020