Limitations
This study had some limitations.
Working with Persian textual data in R and Rstudio statistical program
was so difficult and complicated. Using multi packages and programming
many codes almost reduce this limitation, but it took a long time to run
for cleaning and classifying information from large data volumes.
Another limitation was the incomplete or inaccurate records of patient
information in HIS, which modified or deleted from study. Double coding
in the use of ICD-10 diagnostic codes to distinguish CVDs was another
limitation of this study.