RT Journal Article SR Electronic T1 The Clinical Significance of an Increased Nonprotein Nitrogen Content of the Blood JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 283 OP 294 VO 6 IS 4 A1 McDonald, R. H. YR 1939 UL http://www.ccjm.org/content/6/4/283.abstract AB