How do you prove the value of disease prevention and health promotion? A research team at Harvard Medical School thinks they may have an answer. They have developed a calculator that allows them to estimate the return on investment of prevention services. Dr. Nancy Oriol, dean of students at Harvard Medical School and a leader of the research team, explains how this new tool operates. She also discusses "The Family Van," a mobile clinic program she has helped to operate in the Boston area that inspired their efforts to develop the calculator. To listen to this podcast, click on the media player below. If you don't see a media player below, click here.