[1] Baylor Univ, Med Ctr, Dallas Nephrol Associates, Div Nephrol, Dallas, TX 75246 USA
[2] Baylor Univ, Med Ctr, Div Vasc Surg, Dallas, TX 75246 USA
[3] Univ Texas, SW Med Ctr, Dept Internal Med, Dallas, TX USA
[4] VA Puget Sound Hlth Care Syst, Div Pathol & Lab Med, Seattle, WA USA
[5] Univ Washington, Dept Pathol, Seattle, WA 98195 USA