4Saklad M. Grading of patients for surgical procedures[J]. Anesthesiology, 1941,2(3):281-284.
5American Society of Anesthesiologists. New classification of physical status [J]. Anesthesiology, 1963,24(1): 111.
6Wolters U, Wolf T, Stutzer H.ASA classification and perioperative variables as predictors of postoperative outcome[J]. BrJ Anesth, 1996, 77(2):217-222.
7Knaus WA, Zimmerman JE, Wagner DP, et al. APACHE : a severity of disease classification system[J]. Crit Care Med,1985, 13(10):818-829.
8Copeland GP, Jones D, Walters M. POSSUM: a scoring system for surgical audit[J]. BrJ Surg, 1991, 78(3): 356-360.
9Whiteley MS,Prytherch DR,Higgins B, et al. An evaluation of the POSSUM surgical scoring system [J]. Br J Surly, 1996,83 (6):812-815.
10Tekkis PP, Prytherch DR, Kocher HM. Development of a dedicated risk-adjustment scoring system for colorectal surgery (colorectal POSSUM) [J]. BrJ Surg, 2004, 91(9):1174-1182.
