11.   Doctors said many factors can cause the condition, including cigarette smoking, high fat diets, genetic predisposition or more immediately, stress and crisis.

12.   External factors cause the crises, but we are still very vulnerable.

13.   In male-pattern baldness, genetic factors cause many dormant follicles to shrink to the point that they grow only fine hair or no hair at all.

14.   Injected into healthy mice, the factor caused a rapid weight loss.

15.   It is also conceivable that some unmeasured factor caused simultaneous increases in use of the Internet and decline in normal levels of social involvement.

16.   Lakey said two other factors caused him to transfer.

17.   Levin said that since his announcement, Wall Street analysts and some journalists have been questioning what factors caused him to step down.

18.   Many factors can cause or contribute to this problem, including a diet rich in saturated fats, cigarette smoking, high blood pressure and diabetes.

19.   No one factor caused the havoc that left traders like one on the floor of the New York Stock Exchange, left, in despair.

20.   Other factors can cause a volunteer to be rejected, such as a history of substance abuse.