الإتاحة: https://doi.org/10.1016/S0140-6736Test(20)31182-Xhttp://hdl.handle.net/11579/113889Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::96fb67eff7ce30f29e410d8d266edd62Testhttps://pubmed.ncbi.nlm.nih.gov/31748296Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::8704fd5a24a56aaf52dff3585c107bafTesthttps://doi.org/10.1016/j.amsu.2016.12.017Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::bb685dc8eb19929d0327790f2b7aed3bTesthttps://doi.org/10.1016/j.amsu.2017.08.007Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::e634ed94029eb97285c799327c546e91Testhttps://doi.org/10.1016/j.amsu.2016.11.049Test