Five years after the introduction of a vigorous detection and treatment program, the prevalence of diabetes mellitus was found to be greater than in the year prior to the introduction of the program. Which of the following are possible reasons?
A. An increase in diabetes case fatality
B. An increase in the age-specific mortality associated with diabetes
C. An increase in previously undetected cases
D. An increase in the proportionate mortality associated with diabetes
E. A reduction in the risk factors predisposing to diabetes