[1] Texas Tech Univ, Hlth Sci Ctr, Dept Internal Med, Lubbock, TX 79430 USA
[2] Alexandria Univ, Fac Med, Clin Oncol & Nucl Med Dept, Alexandria, Egypt
[3] Houston Methodist DeBakey Cardiol Associates, Houston, TX USA
[4] Alexandria Univ, Fac Med, Cardiol Dept, Alexandria, Egypt