11.   But many experts contend that the problems are more acute, and many of the problems are homegrown.

12.   But industry experts contend that perhaps no single athlete has had the same effect on viewership as Woods.

13.   But some experts contend that this approach may cause serious problems down the road.

14.   But some health-care experts contend that the spate of recent citations by the federal Health Care Financing Administration points to cracks in the hospital system.

15.   But many experts contend that the increase does not reflect restoration of a full complement of such cells.

16.   But many experts contend the technical breakthroughs already have been achieved.

17.   But some childhood development experts contend that the issue is not just what children see, but how and where they see it.

18.   But some experts contend that Russia has won points, particularly in Europe, as the more reasonable of the two.

19.   But some experts have contended that others are not so much social science as salvos in a back-door war on the poor.

20.   But some experts contend that the patients would be better off if they remained on the machines even longer.