<qa>  What is the name of the treatment that received continuous TDF therapy?- Received continuous TDF therapy i.e. TDF monotherapy or combination of TDF lamivudine or TDF emtricitabine treatment for at least 4 years prior to screening. If TDF has been used in combination with lamivudine or emtricitabine, lamivudine or emtricitabine must have been stopped at least 12 weeks prior to screening 