KaplanMHFeinsteinAR. The importance of classifying initial comorbidity in evaluating the outcome of diabetes mellitus. J Chron Dis1974;27:387–404.
2.
CharlsonMEPompeiPAlesKLMacKenzieCR. A new method of classifying prognostic comorbidity in longitudinal studies: Development and validation. J Chron Dis1987;40:373–83.
3.
KnausWAWagnerDPDraperEAZimmermannJCBergnerMBastosPG. The APACHE III prognostic system. Risk prediction of hospital mortality for critically ill hospitalized adults. Chest1991;100:1619–36.
4.
SmithAP. Design a clinical information system. BMJ1992;305:415–17.