الإتاحة: https://doi.org/10.1016/S0140-6736Test(18)32261-Xhttp://hdl.handle.net/2108/211304Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::59d4ec9ecfc5de196d10fa095be2b4f5Testhttp://hdl.handle.net/11591/404343Test