It occurs primarily in those 16 to 30 years of age and 51 to 70 years.

The abuse occurred primarily between the 1930s and 1970s.

Growth is reported to occur primarily on the upper eyelashes.

The exhibitions primarily occur in the spring and summer months.

It looks like it's primarily occurring on 500 series cards.

The increase, he said, is occurring primarily because more people are going to the beach or taking part in water sports.

The development of the suburb primarily occurred during the 1970s and 1980s.

It primarily occurs between the ages of 20 to 50 years.

Less commonly pain may occur primarily in the back or top of the head.

My experience with injuries and their treatment, which occurred primarily in junior college, taught me much about the culture of football.