الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1494f8ae6b6b3f19e47d808e952ae52aTesthttps://europepmc.org/articles/PMC2839343Test/
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a5769b3202a0daaea275d3fd1a39ccdaTesthttps://europepmc.org/articles/PMC2219734Test/