Potential subjects will then be asked to read the consent form. If they think they meet the inclusion and exclusion criteria and are interested in proceeding they will meet with the physician in private (in a conference room across the hall) after the session. The physician will determine their eligibility (as per inclusion and exclusion criteria). A Healthy Heart volunteer will then witness their signing of the consent form. They will be asked to sign a second consent form that will be marked "copy" and given to them.