الوصول الحر: https://doaj.org/article/7d6554c86eaf4a50b052bd75df1555f1Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1504013091698ac002dabe5f77910ceTesthttps://www.karger.com/Article/FullText/489805Test