− CD4 (if clinically indicated) . − HLA typing (where feasible) • Urine or s erum pregnancy test (β -HCG) for females of childbearing -potential and women < 12 months since the onset of menopause (within 16 days prior to enrollment). • Urinalysis. • HBV, HCV, HIV testing including viral load if clinically indicated (within 3 months prior to enrollment). • Histologic confirmation (at any time point prior to enrollment).