41.   But as doctors acquired more effective treatments, the impetus to prognosticate declined.

42.   But cataract-clouded lenses can be replaced with plastic inserts, while there is no effective treatment for macular degeneration in most sufferers.

43.   But for some health problems, these collagen barriers can block any effective treatment.

44.   But experts disagree on the ethics of withholding effective treatment from children when studying nonfatal conditions such as allergies or skin rashes.

45.   But investigators advise caution in interpreting the results, noting that many promising early findings have failed to lead to effective treatments for AIDS patients.

46.   But it is too soon to say whether the new drug will be an effective treatment, he added.

47.   But Lubin said there are no effective treatments, other than transplant, for sickle cell or thalassemia.

48.   But locating effective treatment for traumatic stress symptoms can be difficult.

49.   But the next step, effective treatment for those who discover that they have contracted the virus, is still generally nonexistent.

50.   But such worries pale next to the situation of the nations most desperately in need of an effective treatment.