RT Journal Article SR Electronic T1 Evaluation of Gastrointestinal Bleeding by Red Blood Cells Labeled in Vivo with Technetium-99m JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 1080 OP 1086 VO 20 IS 10 A1 Gary G. Winzelberg A1 Kenneth A. McKusick A1 H. William Strauss A1 Arthur C. Waltman A1 Alan J. Greenfield YR 1979 UL http://jnm.snmjournals.org/content/20/10/1080.abstract AB