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Moreover , with a larger market , " it is easier to attract aggressive bidders to your auction who will bid up the price of your item to an appropriate level . Preventive medication is considered successful if it results in a 50 percent reduction in the intensity of tension-type head pain or in the frequency and duration of attacks . It is intended to ensure that you will spend at least two years in your home country before coming back to the U.S. for a long-term stay . Then , the agency 's surveillance veterinarians analyze the reports to determine whether the drug could have caused the clinical signs described in the report and use a scale to rate how probable it is that the sign was caused by the drug . Rep. Edward Markey , D-Mass ., a senior member of House panels on energy and natural resources , said he hoped it would n't take until Groundhog Day two years from now , when a new president is in the White House , to alter course in the United States .