Type-2 diabetes may be the plague of this century. Just 20 years ago, about 30 million people in the world had the disease. Today, it’s more than five times that many. It’s a frightening prospect for health, and the health care system. Here in North Carolina, diabetes is already a direct or contributing cause in one out of every five hospitalizations. That’s billions of dollars of every year. Experts say health care providers need more effective ways to treat diabetics so they don’t end up in the hospital. A group of clinics in eastern North Carolina is trying to do it with a new model for treating chronic disease.