الإتاحة: https://doi.org/20.500.11768/109385Testhttps://doi.org/10.2337/dc19-0880Testhttps://hdl.handle.net/20.500.11768/109385Test
الوصول الحر: https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-6103Testhttp://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Retrieve&list_uids=15365614&dopt=CitationTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28537cfa6851fd3118b18969e39f2fadTest
الإتاحة: http://stacks.cdc.gov/view/cdc/33814Test/