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The site selection criteria included the following elements and were tailored and expanded to accommodate the specific requirements for the countermeasure to be studied . Coverage recently expanded to include the rapidly expanding base of internet applications available to researchers . In recent years , the definition of placebo has been expanded to include other things that could have an effect on the results of health care . Of greater concern to world peace is that , through this interview and related comments , Bush 's doctrine of preemption has been expanded to include the right to invade a country if a US president determines that the government of that country poses even a hypothetical threat some time in the future .