11. Patients on COX 1 or 2 prostaglandin inhibitors (e.g. ASA, other NSAID's, Celebrex®, Vioxx® ) who can not comply with guidelines or concomitant therapy as outlined in appendix V, i.e.; avoid from midnight before treatment until midnight post treatment. Patients who are required to take low dose aspirin (81 mg) may be allowed to continue taking low dose aspirin.