Alanine aminotransferase (ALT) measurement. Blood was collected before dosing on day 1 (baseline), and days 2, 5, 10, 13, 16, 20, 24, and at end of the follow-up phase. Solid and dashed lines represent placebo and moxifloxacin treatments, respectively. EOS is End of Study. Values represent fold change over upper limit of normal (ULN).