[1] Univ Utah, Internal Med, Salt Lake City, UT USA
[2] Univ Utah, Study Design & Biostat Ctr, Salt Lake City, UT USA
[3] Univ Utah, Vasc Surg, Salt Lake City, UT USA
[4] Univ Utah, Mol Med, Salt Lake City, UT USA
[5] Intermt Med Ctr, Pulm & Crit Med, Murray, KY USA
[6] George E Wahlen VAMC, Internal Med, Salt Lake City, UT USA