Results
A total of 624 patients were randomly selected for the study and of those, 554 were eligible. The remainder of the patients were ineligible due to different diagnosis such as epilepsy and congenital heart diseases. A total of 400 patients agreed to participate in the study, a response rate of 72%. There were 210 (52.5%) men and 190 (47.5%) women. The mean age was 57 years with standard deviation (SD) of 9.5. The diagnosis, age and gender distributions of the enrolled subjects were not significantly different from that of the eligible population (mean age of 55 years and 1:1 male-to-female ratio). The details of the demographic and medical profiles of the subjects are shown in Table 1.