11.   Doctors could not explain why the boy would go into cardiac arrest, Maria said, but suspected that his air supply had been cut off.

12.   Doctors explained to him that the aneurysm had gone undetected and that the attack could have happened anywhere, anytime.

13.   Doctors have never explained what kind of treatment they provided Yeltsin in July, when he had his first episode of ischemia.

14.   Doctors could not explain it.

15.   I listened as the doctor explained.

16.   If the woman hesitates, her doctor will often explain that the hormones can protect her against heart disease, the leading killer of women.

17.   In a related article, a Palestinian doctor explains why so many of his people want to be martyrs.

18.   It was common in patients with amnesia, the doctor explained, to continue, shortly after the trauma, to forget.

19.   Once doctors have explained a regimen and addressed the cost issue, they need to motivate patients to follow through.

20.   She had experienced a gallbladder attack, the doctor explained carefully.