 Following the end of treatment, you will return to the clinic every 6 months for 2 years. You will have a complete physical exam, including measurement of vital signs. You will have a careful examination of the inside of your mouth. You will have blood drawn about 2 teaspoons for routine tests, to check your liver function, and for research testing. Your study doctor will ask you about any medications you are taking and how you are feeling symptoms, and your current tobacco and alcohol use. 