Back to matchesWe found a matchYour institution may have rights to this item. Sign in to continue.TitleThe Serum Levels of the Heavy Metals Cu, Zn, Cd, and Pb and Progression of COPD—A Preliminary Study.AuthorsValkova, Elica; Atanasov, Vasil; Vlaykova, Tatyana; Tacheva, Tanya; Zhelyazkova, Yanitsa; Dimov, Dimo; Yakimov, KristianPublicationInternational Journal of Environmental Research & Public Health, 2023, Vol 20, Issue 2, p1427ISSN1661-7827Publication typeArticleDOI10.3390/ijerph20021427