الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::c70221161cfda05578ed827de4d67058Testhttps://doi.org/10.1183/13993003.congress-2021.oa4315Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::5b49b624fe3adfa12c66687721718822Testhttps://doi.org/10.1183/13993003.congress-2016.pa3902Test