11.   He also underwent a series of tests and X-rays on his head and neck, all of which showed only deep bruising.

12.   Greene had undergone a series of brain operations.

13.   He hobbled to the locker room with team physician Dr. Gerald Finerman and underwent a series of tests.

14.   He underwent a series of strokes, which paralyzed him, then heart attacks.

15.   He underwent a series of operations, but never recovered the ability to use his right arm.

16.   He spent five days at the University of Massachusetts Medical Center in Worchester, undergoing a series of tests that ruled out problems with his heart and brain.

17.   I developed the condition after undergoing a series of chemotherapy treatments.

18.   In the weeks since, he had undergone a series of surgeries, said Dr. Joseph Fedorchik, the lead physician treating Comstock.

19.   It has undergone a series of incarnations.

20.   Like an aging sedan, Mir has undergone a series of mishaps.