Inci Sezen A, Bugra Sezen C, Sokulmez Yildirim S, Dizbay M, Ulutan F. Cost analysis and evaluation of risk factors for postoperative pneumonia after thoracic and cardiovascular surgery: a single-center study. Curr Thorac Surg. 2019;  4(2):  056-062. http://dx.doi.org/10.26663/cts.2019.00011