الإتاحة: https://doi.org/10.1164/rccm.201606-1306OCTesthttp://hdl.handle.net/10447/274729Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::96954389f3918ce9ccce0102c6345a54Testhttps://doi.org/10.1097/ccm.0000000000003519Test
الإتاحة: https://doi.org/10.1001/jama.2016.0291Testhttp://hdl.handle.net/11571/1165481Testhttp://jama.jamanetwork.com/article.aspx?articleid=2492877Test