الوصول الحر: https://doaj.org/article/4c6814f7671843b785ed43aec72dc7bdTest
الوصول الحر: https://doaj.org/article/59e18f865c4b47229bf522dbb7b2c20dTest
الإتاحة: https://doi.org/10.1186/1471-2334-12-87Testhttps://doaj.org/article/bcfc0f67f428427fb5752e54e4978fd1Test
الإتاحة: https://doi.org/10.1186/1743-422X-8-78Testhttps://doaj.org/article/96318ff51b174df8b27a003664e946eeTest
الإتاحة: https://doi.org/10.1186/1471-2229-10-140Testhttps://doaj.org/article/db9109621ab44967af0248a8e4150535Test
الإتاحة: https://doi.org/10.1186/1471-2164-10-632Testhttps://doaj.org/article/4428941c86704dcc9aecefb980e838b5Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5728d1a4fb0904e23da66ce7fb34583cTesthttp://www.biomedcentral.com/1471-244X/12/46Test