 14. Current or chronic hepatitis B or C infection, or known seropositivity for HIV. Note: Patients with previous history of Hepatitis B who have cleared the infection and have natural immunity, i.e. Hep B core antibody positive cases are excluded if prophylaxis against Hep B reactivation with antiviral agents such as entecavir is recommended, after consultation with gastroenterologisthepatologist or infectious disease team. 