RT Journal Article SR Electronic T1 The Comparative Values of Retrograde and Intravenous Urography JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 79 OP 82 VO 1 IS 2 A1 Nichols, Bernard H. YR 1932 UL http://www.ccjm.org/content/1/2/79.abstract AB