الوصول الحر: https://doaj.org/article/3071fe4624ac4e97a1ea6e9bb9bd1f19Test
الإتاحة: https://doi.org/10.2147/PPA.S318859Testhttps://hdl.handle.net/2434/915412Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c40185637a62209578a8012953c5ebaTesthttp://europepmc.org/articles/PMC8370582Test