الوصول الحر: https://doaj.org/article/a63c0e0266e34366b30660e184a94201Test
الإتاحة: https://doi.org/10.1186/s13023-019-1103-8Testhttps://doaj.org/article/9a328ce2a35d47f09c3c4bc026f358dcTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85a2896e190acd33d257649bc13b1f3dTesthttps://doi.org/10.1186/s13023-021-02065-zTest