b'Luna Bhatta, MD Luna Bhatta, MD, talks about stereotaxis to treat specific heart problems., talks about stereotaxis to treat specific heart problems. Leslie Kohman, MD Leslie Kohman, MD, provides an update on cigarette smoking and electronic cigarettes., provides an update on cigarette smoking and electronic cigarettes. Margaret Formica, PhD Margaret Formica, PhD, explains how firearm violence is a public health issue., explains how firearm violence is a public health issue.'