1. What is the marginal cost for marginal risk in cardiac surgery?
Thomas E Williams, MD, William J Fanning, MD, W.C Benton, PhD, Gerard S Kakos, MD, Randall L Miller, MD, William J Esterline, MD, Thomas D Hankins 
The Annals of Thoracic Surgery 
Volume 66, Issue 6, Pages (December 1998)
DOI: /S (98)

2. Fig 1
Mean postoperative length of stay (LOS) versus mean risk for original Parsonnet risk groups for patients at Grant Hospital, 1992 through 1996.
The Annals of Thoracic Surgery  , DOI: ( /S (98) )