Fukui, T., S. Manabe, T. Shimokawa, and S. Takanashi. “Incidence and Outcomes of Pneumonia After Isolated Off-Pump Coronary Artery Bypass Grafting”. The Heart Surgery Forum, vol. 12, no. 4, Aug. 2009, pp. E194-E198, doi:10.1532/HSF98.20091021.