And we don't base this on theory, but on what is now happening in practice.

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You base this on the slippery-slope argument: selected cases may grow into casual practice over time.

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Capitalizing on its customer base of 60, 000 doctors, electronic health record provider Practice Fusion launched a free booking and review service for physicians and their patients.

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So a valuation would hone in on the historical profit of the practice and try to project forward how large and loyal the customer base is.

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