A POSSIBLE FOURTH PLASMA THROMBOPLASTIN COMPONENT

^{Department of Medicine, Stanford University School of Medicine, San Francisco}

^{Veterans Administration Hospital, Oakland, Calif.}

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^{Department of Medicine, Stanford University School of Medicine, San Francisco}

^{Veterans Administration Hospital, Oakland, Calif.}

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^{Department of Medicine, Stanford University School of Medicine, San Francisco}

^{Veterans Administration Hospital, Oakland, Calif.}

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