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subscription/membership/fee required Atypon https://journals.sagepub.com/doi/10.1258/0956462001915327?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
HIV free resource MedlinePlus Health Information https://medlineplus.gov/hiv.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=11138916.ui
Cited by Patents in free resource The Lens - Patent Citations https://www.lens.org/lens/search/patent/list?q=citation_id:11138916