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While taking the exam to renew his physician specialty certification, pulmonologist Jordan Metcalf got hung up on a question about a rare complication in a bone marrow transplant patient — a hematology issue.

“I’m a pulmonary critical care guy,” said Metcalf, a professor in University of Oklahoma’s College of Medicine. “If I have some really wild stuff going on hematologically in a patient, shouldn’t I be calling, say, a hematologist?”

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