Shokoohi, Hamid, Keith S. Boniface, Bruce M. Abell, Ali Pourmand, and Mohammad Salimian. 2015. “Ultrasound and Perforated Viscus; Dirty Fluid, Dirty Shadows, and Peritoneal Enhancement”. Archives of Academic Emergency Medicine 4 (2):101-5. https://doi.org/10.22037/aaem.v4i2.229.