الإتاحة: https://doi.org/10.1097/md.0000000000012558Testhttps://journals.lww.com/00005792-201810050-00029Test
الإتاحة: https://doi.org/10.1213/ane.0000000000005278Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c2dc39e14f37c7c85a07be4f47452d6eTesthttp://europepmc.org/articles/PMC5225389Test