build a wordpress landing page with a questionnare . So people will fill out a form, then depending on how they answer, they will be shown different messages. For example if someone qualifies to do a clinical trial, they will see a message that says, "you are qualified for this trial," if not, they will see a different message.
Here is an example of a similar landing page, [login to view URL]
41 freelancers are bidding on average $163 for this job
Have a look at this link - [login to view URL] to ensure my expertise on WordPress. I am well versed in PHP, can code custom functionality as well as I am good at Photoshop.