Retrieving a list of all your patients above 30 years of age who do not have the diagnosis "Cardiovascular Risk Factor/s" on their problem list.

1. Retrieve a list of all your patients aged 30 and above.
2. Retrieve a list of all your patients who have the diagnosis "CARDIOVASCULAR RISK FACTORS".
3. Take the first list and erase from it all the names appearing on the second list.

You are now left with a list of patients older than 30 who, to date, are not known to have any cardiovascular risk factors.