1 IBM T.J. Watson Research Center (Cahan), Yorktown Heights, NY; National Library of Medicine (Cahan); National Institutes of Health Clinical Center (Cimino), Bethesda, Md.; Informatics Institute (Cimino), School of Medicine, University of Alabama at Birmingham, Birmingham, Ala. acahan@us.ibm.com.
2 IBM T.J. Watson Research Center (Cahan), Yorktown Heights, NY; National Library of Medicine (Cahan); National Institutes of Health Clinical Center (Cimino), Bethesda, Md.; Informatics Institute (Cimino), School of Medicine, University of Alabama at Birmingham, Birmingham, Ala.