الإتاحة: https://doi.org/10.1093/bjsopen/zrab150Testhttps://hdl.handle.net/11573/1658208Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9fe7f5930f04b3b45e80e5ddd6397588Testhttps://pubmed.ncbi.nlm.nih.gov/21971927Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::c270cb4de75f0930e1dd0a2952c88284Testhttps://doi.org/10.1055/s-0031-1285256Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bcfe7df3d826eb9b59ebeb51a2059eacTesthttps://pubmed.ncbi.nlm.nih.gov/15203642Test