Participating in research is an important contribution you can make to help doctors better understand how to treat different medical conditions. In most research studies, you may receive an investigational (not yet approved) medication or placebo. Study examinations typically come at no cost to you and compensation for your time and travel is usually available. Before any study procedures take place, you will be provided with a consent form that will help you understand the study and its design. Your participation is voluntarily and can always be withdrawn.