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Does exercise affect the number of muscle cells?

Washington.edu reported that:

Muscle cell number is affected by exercise level while young

and elitefitness.com said:

a trainee in the early stages of training would increase cell number

Where an unreferenced page on wikipedia said the opposite:

Contrary to popular belief, the number of muscle fibres cannot be increased through exercise.

Which one is true, I'm a little bit confused?

Note: I'm not asking about the increase in the cells' myofibril count, but the increase in the numbers of cells themselves.