41.   Doctors think GnRH-a works by slowing egg development, a process that makes the eggs less likely to be attacked by chemotherapy.

42.   Doctors think this detracts from the exercise experience, one benefit of which is to reduce stress.

43.   Doctors thought at first it was a bad case of flu.

44.   Doctors first thought Stevens had meningitis, but they were not sure.

45.   Doctors have thought he has congenital sensory neuropathy, an incurable genetic disorder that prevents people from experiencing pain the way most people do.

46.   Doctors initially thought he had developed one of the many types of cancer that often complicate the course of someone with AIDS.

47.   Doctors still think his comeback is a long shot.

48.   Doctors think Nelson had hurt his leg in a long fall the day before and might have been in too much pain to flee from where he landed.

49.   Doctors initially thought gall stones were the problem, but tests ruled them out.