Pharmacoepidemiology observational study where immortal bias influenced the effects of a particular drug

identify 1 pharmacoepidemiology observational study where immortal bias influenced the effects of a particular drug.

II) than Write brief description summary of that study:

a. Including information on the study design, source of the immortal bias, impact of the bias on the results of the study and some of the proposed solutions to the problem, i.e.,  through adjustments that would have been made during design or analysis stages.

You will be finding your own article to use for this discussion.

You can use pubmed or any other site to find your study