In the event of a tie, The Wall Street Journal will randomly select one winner.

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Scientists will randomly select 400 patients who have undergone surgery from hospitals across the UK to take part in the study.

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However, to achieve this goal the NCS planners made a decision to randomly select neighborhoods within each county and to have study personnel go door-to-door to recruit women who were pregnant or planning to become pregnant, much as census workers do to reach under-represented groups.

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"Because of that, they tend to select symbolic targets, they don't often randomly attack people on the street, " he says.

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