Liver biopsies were conducted at study screening, and at Step 2 entry and exit until the early closure of Step 2. Medical history assessment, physical exams, and blood collection were conducted every 4-12 weeks for participants in Steps 1, 2, and 3. Participants were followed for up to 18 weeks in Step 1, followed by a total of 72 in Step 2 or by up to a total of 84 weeks in Step 3.