Bibliographical noteFunding Information:
From the Cardiovascular Division, Minnesota Medical School. Supported by grant HL 22977 from the National Heart, Lung, and Blood Institute and by the National Institutes of Health Clinfo computer system, grant RR-400. Received for publication Dec. 15, 1986; accepted Feb. 2, 1987. Reprint requests: Jay N. Cohn, M.D., Box 488, Mayo Memorial University of Minnesota Medical School, Minneapolis, MN 55455.