الإتاحة: https://doi.org/10.1186/s12882-022-03020-1Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::b0e401d3963ccaa15aabb2336567b872Testhttps://doi.org/10.1007/bf03175437Test
الإتاحة: https://doi.org/10.1007/s11276-012-0451-2Test