b'Heart surgeon Heart surgeon Barry Esrig, MD Barry Esrig, MD, explains coronary artery disease and its treatments. Infectious disease expert, explains coronary artery disease and its treatments. Infectious disease expert Elizabeth Asiago-Reddy, M Elizabeth Asiago-Reddy, M D, tells about ways to reduce the risk of HIV infection. Ear, nose and throat specialist D, tells about ways to reduce the risk of HIV infection. Ear, nose and throat specialist Jesse Ryan, MD, Jesse Ryan, MD, describes treatment options for cancers of the head and neck. describes treatment options for cancers of the head and neck.'