It occurs mainly in women, but is very rare now.

This migration occurred mainly during the years of 1940 to 1970.

It is a condition that occurs mainly in older people, especially women.

Officials said yesterday that the decline had occurred mainly among high school students.

Births occur mainly in winter, usually of only one young.

Spawning may last from five to ten days and occurs mainly at night.

Rain occurs mainly in winter, with summer being generally dry.

As of May 3, 2008, 3736 cases occurring mainly in children were reported, with 22 dead and 42 critically ill.

But this occurs mainly in children, teens, and young adults.

They occur mainly on the dry plains and lower hills.