الوصول الحر: https://doaj.org/article/50fdbb535e1c495fb679089270e389ffTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d556061e7da9239497a96ba2dc1caa08Testhttps://doi.org/10.1186/s40795-021-00476-6Test