91.   Only then can the doctor know which drug to try next.

92.   Other factors may stimulate the development of breast cancer, doctors know.

93.   Ramonna Tooley, a hospital spokeswoman, said doctors would know by Wednesday whether Shemenski would need surgery, which she called a common procedure.

94.   Some doctors know that patients do not always come right out and say what is troubling them.

95.   Such scanning would also let doctors know what form of chemotherapy might work best for a cancer patient.

96.   That could let doctors know about possible medical complications more quickly.

97.   Team doctors apparently knew for years that Sapolu had a small leak in a valve in his heart since he was quite young.

98.   The biggest obstacle to knowing whether Ebola caused the Athenian plague is that modern doctors know so little about Ebola itself.

99.   The doctor did not know she had been there, the day history was made.

100.   The doctors knew that certain antidotes for poisoning by agricultural chemicals could be effective, but hardly any hospitals in central Tokyo had these antidotes on hand.