1.   He also underwent seven operations in Chicago by a surgeon who refused to charge the wounded veteran.

2.   He did the same thing six months ago when he underwent a heart operation at Washington Hospital Center.

3.   He has already undergone one operation and faces further surgery.

4.   He recently underwent an operation but now he is incontinent.

5.   She recently underwent an operation to restore her sight.

6.   This is particularly the case for patients undergoing operations.

7.   Willis underwent two operations by Patzakis to repair the injury, which involved controlling the infection and transplanting bone from his pelvis.

8.   She will have to undergo an operation.

9.   A few days later, Christopher underwent an operation that helped restore some feeling to his upper body.