Zhao H, Heard SO, Mullen MT, Crawford S, Goldberg RJ, Frendl G, Lilly CM. An evaluation of the diagnostic accuracy of the 1991 American College of Chest Physicians/Society of Critical Care Medicine and the 2001 Society of Critical Care Medicine/European Society of Intensive Care Medicine/American College of Chest Physicians/American Thoracic Society/Surgical Infection Society sepsis definition. Crit Care Med. 2012 Jun; 40(6):1700-6.