Hepatitis A YES / NO Hemophilia YES / NO Hemodialysis treatment YES / NO Rejected or refused blood donation YES / NO HIV/AIDS YES / NO Hepatitis B YES / NO Hepatitis C YES / NO Use of intravenous drugs or medications YES / NO Incarceration YES / NO Abnormal blood tests of liver enzymes YES / NO Accepting money or drugs in exchange for sex YES / NO Receipt of a blood transfusion between 1977 - 1992 YES / NO Infectious gastroenteritis or diarrhea YES / NO