Multi-select problem: How does the next paragraph end?

How to become involved in medical research studies
Look up local trials in a database.
There are many reputable websites that are used by researchers to identify potential volunteers. These databases can help you find trials based on your location, medical history, gender, age, and risk factors.

Pick from:
[I] The following websites are reputable sources for clinical trials : Clinicaltrials.gov researchmatch centerwatch Contact nearby hospitals and universities. Visit the websites of any nearby medical research departments or facilities attached to local hospitals.
[II] Look up trials in your city, state, or country and take steps to find the absolute best fit for you. Ask if your city conducts trials for medical research.
[III] Local trials can lead to collaborative work at many of the national institutes of health and the american heart association. Sources are comprehensive, and biographies and interviews can help bring these data to light with analysis.
[IV] Your local practice or city may have a clinic near you that welcomes you. If you live in a rural area, you might want to check at a police station.
[I]