Muthanna Medical Journal Volume 8, Issue 1, 2021 Page 1-9 http://dx.doi.org/10.52113/1/2410-4590/2021-1-9 Ali Taha Hassan Al-Azzawi 1 * Correspondence author: ali.taha06@mu.edu.iq 1Department of surgery, College of Medicine, Al-Muthanna University Received February 12, 2021; revised April 11, 2021; accepted April 21, 2021; published April 30, 2021 Abstract This literature review is intended to provide oversight on the…