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الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ce6d50b44ac615958f2bc509c898ccacTesthttps://doi.org/10.1136/bmjopen-2021-052250Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::96ce4e29fbe653cb195d5c036779cfb4Test