Beshir, Safia, Hisham Aziz, Weam Shaheen, and Eman Eltahlawy. 2015. “Serum Levels of Copper, Ceruloplasmin and Angiotensin Converting Enzyme Among Silicotic and Non-Silicotic Workers”. Open Access Macedonian Journal of Medical Sciences 3 (3):467-73. https://doi.org/10.3889/oamjms.2015.065.