Saleh, Basil O., et al. “Status of Some Trace Elementsin Idiopathic and Ischemic Cardiomyopathy and Coronary Artery Disease: Echocardiographic Correlation”. Journal of the Faculty of Medicine Baghdad, vol. 52, no. 3, Oct. 2010, pp. 333-7, https://doi.org/10.32007/jfacmedbagdad.523988.