['hepatitis c']
['grazoprevir + elbasvir', 'placebo']

        Inclusion Criteria:

          -  has HCV GT1, GT4, or GT6 with sickle cell anemia, thalassemia, or hemophilia/von
             Willebrand disease

          -  has cirrhosis or is non-cirrhotic

          -  is human immunodeficiency virus (HIV) coinfected or not infected with HIV

          -  is a female of non childbearing potential, or is male or female and uses an acceptable
             method(s) of contraception

        Exclusion Criteria:

          -  has evidence of decompensated liver disease

          -  is coinfected with hepatitis B

          -  has had a malignancy ≤5 years prior to signing informed consent except for adequately
             treated basal cell or squamous cell skin cancer or in situ cervical cancer

          -  has hepatocellular carcinoma (HCC) or is under evaluation for HCC

          -  has clinically-relevant drug or alcohol abuse within 12 months of screening
      