[1] Univ Texas Hlth Sci Ctr San Antonio, Dept Med, Div Nephrol, San Antonio, TX 78229 USA
[2] Univ Texas Hlth Sci Ctr San Antonio, Dept Radiol, San Antonio, TX 78229 USA
[3] Univ Texas Hlth Sci Ctr San Antonio, South Texas Vet Healthcare Syst, Renal Sect, San Antonio, TX 78229 USA
[4] Univ Texas Hlth Sci Ctr San Antonio, Dept Pathol, San Antonio, TX 78229 USA