Sultan Aldosari, et al. “Double-Low Dose Protocol of Computed Tomography Pulmonary Angiography (CTPA) in the Diagnosis of Pulmonary Embolism: A Feasible Approach for Reduction of Both Contrast Medium and Radiation Doses”. Heart Research, vol. 4, no. 2, Apr. 2017, pp. 33-38, doi:10.17140/HROJ-4-139.