الوصول الحر: https://doaj.org/article/a21b8b1d076243e78d00e92bbb673f4aTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::44c8dbe9d1a372ba0f0cebfa34f2853bTesthttps://pubmed.ncbi.nlm.nih.gov/34063739Test