1.   A final factor contributes to the low income of garbage pickers and this relates to their involvement in the international economy.

2.   Complex economic and social factors have contributed to the rise in violent crime.

3.   Could these factors contribute to a dramatic drop in the self-esteem of schoolgirls?

4.   Many factors can contribute to thinning hair, including stress, diet, illness and even pregnancy as well as the natural ageing process.

5.   Many factors contribute to this unsatisfactory situation.

6.   Over the course of this century various factors have contributed to the shift towards non-manual employment.

7.   Several factors contributed to the appeal of the new ideology.

8.   Several factors most likely contribute to the development of chronic constipation such as intrinsic slow colonic motility and stool withholding secondary to painful large bowel movements.