severe acute respiratory syndrome : temporal stability and geographic variation in case - fatality rates and doubling times
 we analyzed temporal stability and geographic trends in cumulative case - fatality rates and average doubling times of severe acute respiratory syndrome ( sars ) . in part 
 , we account for correlations between case - fatality rates and doubling times through differences in control measures . 
 factors that may alter future estimates of case - fatality rates , reasons for heterogeneity in doubling times among countries , and implications for the control of sars are discussed . 
Supplementary Material