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Still, the procedure -and the $7,000 price tag -was worth it, he said.

Later that night at his hotel, Stevenson realized he wasn't tired and he says he has not experienced any fatigue since.

"I can get up earlier, work all day and stay up late," he said.

He also says he can sense improvement in his mobility even though it may not yet be apparent to others.

"To me it's like night and day," he said.