الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a6c53c73724849c1eb8399293406da35Testhttps://doi.org/10.4269/ajtmh.1991.45.249Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::823cf665d7654d8f0ed7676e21b78776Testhttps://pubmed.ncbi.nlm.nih.gov/3285214Test