More patients with the hepatitis C virus, the leading cause of liver failure, are turning up in doctors' offices across Metro Detroit with liver damage - a phenomenon likely to drive up health care costs. About 20 percent of persons with the virus will eventually need liver transplants, but "there\'s just not enough livers to go around,\" said Dr. Milton Mutchnick, head of gastroenterology at Wayne State's School of Medicine. \"It\'s really an epidemic here in Detroit.\"