Volunteers are always fully informed of the study requirements, required visits, tests, procedures, etc. Additionally, volunteers are always made aware of any known or likely risks of a study or any new risks that are discovered during the study. Volunteers should ask as many questions as they need in order to feel comfortable with participating. Make sure that you know exactly what will be required of you and that you are willing to perform the required tasks in the study. Also make sure that you understand the benefits and risks of the study and that you can accept the risks of participating. You may also request to speak directly with the principal investigator of the study, and you may want to discuss the study with your primary care physician (PCP) prior to agreeing to participate.