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الإتاحة: https://doi.org/10.1111/CEA.13325Testhttps://hdl.handle.net/10067/1593800151162165141Testhttps://repository.uantwerpen.be/docman/irua/ab1906/159380.pdfTest
الإتاحة: https://doi.org/10.1136/thoraxjnl-2012-202285Testhttp://thorax.bmj.com/cgi/content/short/thoraxjnl-2012-202285v1Test
الإتاحة: https://doi.org/10.1159/000129607Testhttps://www.karger.com/Article/Pdf/129607Test
الإتاحة: http://hdl.handle.net/11365/1002876Testhttp://docstore.ingenta.com/cgi-bin/ds_deliver/1/u/d/ISIS/57715325.1/iuatld/ijtld/2010/00000014/00000008/art00022/55CE207F51C0934D1279307596B96D9BADDE34B84B.pdf?link=http://www.ingentaconnect.com/error/delivery&format=pdfTest
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الوصول الحر: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::03600cf3d65d7c44aa08507aebbcf083Testhttp://www.scopus.com/inward/record.url?eid=2-s2.0-77954710537&partnerID=MN8TOARSTest