I would like to add another thought:

Your attitude makes me sick and gives me doubts about clinical studies, should that be the common way of planning them. These involve human beings, if you don't know how to do this properly, have no clue about it, and instead need to ask random people on the internet, you possibly should not be doing this!

Edit: I was of the impression that you are involved in planning a clinical trial, now I notice that the writing is so vague it could mean anything from "you are participating in a clinical trial as patient" , " found some data about a trial for my analysis", to "working for a pharma company/ med school organizing clinical trials",...