11.   Holtz underwent surgery Tuesday to remove a disc in his neck that was bulging and compressing his spinal cord, causing weakness in his arm and leg muscles.

12.   In gene therapy, a working gene is inserted to compensate for genetic flaws like those that lead to muscular dystrophy, a progressive muscle disease that causes weakness.

13.   In severe cases, the powerful emotions affected sleep, attention to work and even caused physical weakness.

14.   Injections of the food-poisoning toxin cause muscle weakness and are becoming an increasingly popular but little publicized treatment for stiff muscles in cerebral palsy.

15.   Most brokers interviewed said the uncertain political situation in the region and the strict monetary policy of the State Central Bank caused the weakness.

16.   There are concerns that the drug causes muscle weakness, leading in some cases to liver failure.

17.   Traders said heavy dollar demand is causing the weakness in the peso as market players shore up their supply to cover short positions.

18.   Vonk suffers from an illness that causes muscle weakness in the hands and feet.

19.   Zedillo is less than a month into his six-year term and uncertainty about his leadership is another factor causing weakness.