الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f78cc5946d98385b2d919896c023751aTesthttp://link.springer.com/article/10.1186/s12889-020-8436-zTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f1c57f5e23e035b16c4e7f937a7b21b2Testhttp://hdl.handle.net/11427/15006Test