21.   Augustine said doctors believe the dizziness and fatigue are the result of a virus he caught around the time of the season opener against New Mexico.

22.   Because of all the serious health risks associated with chicken pox, doctors initially believed demand for the vaccination would be high.

23.   Because of all the serious health risks associated with chicken pox, doctors initially believed demand for vaccination would be high.

24.   Because the chicken pox vaccine contains live, attenuated virus, doctors believe it could be dangerous to give the vaccine to anyone with a weakened immune system.

25.   Before then, doctors believed he had suffered a spider bite.

26.   Also, many doctors did not believe that tamoxifen added benefits beyond chemotherapy for such women.

27.   But doctors believe very large numbers are going abroad for kidney transplants, mostly to the Philippines and China.

28.   But even if the man does not have anthrax, Kerkvliet said, his doctors believe that his exposure may be responsible for his symptoms.

29.   But many doctors believe the balance of evidence will shift in favour of early medication with drug cocktails.

30.   But the doctor believed he was not obligated to tell patients whether he was infected with the AIDS virus, and continued to perform surgery.