The two other groups, the massage therapy and acupuncture treatments not known to ease depression, were used as controls.

VOA: standard.2010.03.03

If vaccine supplies are limited, then the committee says two groups of children should be vaccinated before other children.

VOA: special.2009.08.05

"The two groups who have the most in common are killing each other,"

VOA: standard.2009.11.25