7. Willingness to refrain from use of aspirin, Ibuprofen, Naproxen or any other NSAID prior to each study treatment and chronic use during the entire post-treatment study period. Washout period, if chronic user, for 4 weeks prior to the first treatment. After all study treatments are completed, limited acute NSAID use is allowed. A maximum of 2-3 doses, in the 2 weeks prior to study follow-up visits is allowed, if needed.