I am trying to create a cohort with people who are not using a particular drug (who do not have any record of a specific drug_concept_id in the drug_exposure table) in ATLAS.
I am not sure how to set up the cohort entry event, I believe I need to consider the entire population in the dataset and then add the inclusion criteria setting the occurrences to “0” for those drugs which I want to exclude. But I don’t see there is a way to add entire population in the cohort entry event.
Can someone guid me how to build a cohort when I want to exclude something from the entire population? Is there a better way to do this in ATLAS? I might even consider using HADES for this if there is a better approach in it.
Thank you so much for your help in advance.