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A, Variation in annualized volume of ULM PCI across operators. B, Variation in annualized volume of ULM PCI across operators averaging at least 1 ULM PCI per year. C, Variation in annualized volume of ULM PCI across institutions. D, Variation in annualized volume of ULM PCI across institutions averaging at least 1 ULM PCI per year.
