The 14 teams are divided into two groups of seven and after a round-robin section the top four from each group will go through to the quarter-finals.

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Over twelve weeks, researchers at the University of Indiana divided weight loss participants into two groups: a group that went to a traditional fitness center and a group that received their workout training and advice at a virtual gym through Second Life.

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They were then divided into two groups: the first was to undergo three sessions of HIT a week, for two-weeks, while the second acted as a control group.

BBC: Exercising

This study randomly divided patients into two groups - one received the antibiotic and the other was given a placebo, an inert treatment in the form of a sugar pill, three times a day for seven days.

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They divided their animals into two groups, and treated the noses of one with Pam2Cys and those of the other with a saline solution, to act as a control.

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In a 2007 study, University of Kentucky psychologists Nathan DeWall and Roy Baumesiter divided several dozen students into two groups.

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