Developers can't agree what MRA actually is.
University of California at San Francisco.
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D000005:Abdomen / Q000098:blood supply; D000792:Angiography; D001921:Brain / Q000098:blood supply; D002339:Carotid Arteries / Q000000981:diagnostic imaging; D016893:Carotid Stenosis / Q000000981:diagnostic imaging; D006801:Humans; D007866:Leg / Q000098:blood supply; D008279:Magnetic Resonance Imaging; D012039:Regional Blood Flow