The case control study looks back through time at potential exposures that both groups (cases and controls) may have encountered.

Small groups of students are taught at local general practices and encounter the many services for ensuring health in the community.

It seems that the groups encountered, at any one time, could only have come from a rather small part of the island.

The group encounter him soon after returning from Hell and he decides to join with them.

The group has encountered the evidence of the lost city, and begun to appreciate its nature.

The group encounters more thugs and works together, despite its differences, to bypass them.

After setting off, his group encounters many adventures, becoming much closer in the process.

The group encountered some personnel changes following the two hits.

One day the group encounters a lion who attacks them.

The two groups encounter one another, and after some conflict find common ground in old sorrows.