1. Preoperative risk assessment in cardiac surgery: Comparison of predicted and observed results;Junod;Ann Thorac Surg,1987
2. A method of uniform stratification of risk for evaluating the results of surgery in acquired adult heart disease;Parsonnet;Circulation,1989
3. Adult open heart surgery in New York state;Hannah,1990
4. Identification of patients at greatest risk for developing major complications at cardiac surgery;Hammermeister;Circulation,1990
5. Stratification of morbidity and mortality outcome by preoperative risk factors in coronary artery bypass patients;Higgins,1992