 - The participant is receiving chronic therapy with nonsteroidal anti-inflammatory drugs NSAIDs; for example, indomethacin, ibuprofen, naproxen, or similar agents or other antiplatelet agents for example, clopidogrel, ticlopidine, dipyridamole, and anagrelide. Aspirin acetylsalicylic acid use at doses up to 325 milligramsday is permitted. 