title: Aiming beam degradation in Laserscope Pulsar/Paragon CO2 laser.
mesh_terms: D004868:Equipment Failure; D006801:Humans; D053685:Laser Therapy / Q000295:instrumentation*; D010608:Pharyngeal Diseases / Q000601:surgery; D013523:Surgical Equipment / Q000592:standards; D014481:United States