Millions of people around the world at risk for  disease are taking a statin drug to help lower bad cholesterol, known as LDL [Low Density Lipoprotein].  But statin drugs are not as effective in raising HDL [High Density Lipoprotein], the good cholesterol in the blood that helps fight  disease.  Now doctors are excited about a new drug that dramatically increases those HDL levels.  But as VOA’s Melinda Smith reports, patients may still have to wait a few years before the drug is available to the public.