Administration of the next dose level will occur only if the preceding dose was determined to be safe and well tolerated. The decision to proceed to the next higher dose level will be made by a Safety Review Committee (SRC) based upon review of efficacy and safety data including AEs, safety laboratory results, vital signs and ECGs. PK data for up to 12 hours post-dose will also be reviewed. The review will be conducted after the last subject in a cohort completes the Day 28 visit. The planned dose levels can be modified based on the data reviewed.