Earlier quoted context omitted.
If a study like this needs a complicated IRB approval or extra data collection vs what’s already being collected for health records, you’re doing it wrong and the process has become more important than the problem you’re trying to solve.
What happens if your study clearly hurts people? What happens if your study clearly helps people? You find out in the first few weeks, what do you do? How do you ensure you collected enough of a sample of a general population to make your study representative? How do you ensure your patients properly consented to the study (past shameful human experiments aside, you likely need many institutions participating, so you…
We're talking about a factor that no one has previously had reason to consider important.
Of course, I don't know hard it truly is to undertake a study. I have to imagine for something like this you could write up a basic study protocol in fairly short order.