[1] Univ Texas Southwestern Med Ctr Dallas, Div Cardiol, Dallas, TX 75390 USA
[2] Vet Adm North Texas Healthcare Syst, Dallas, TX USA
[3] Univ Texas Southwestern Med Ctr Dallas, Dept Med, Dallas, TX 75390 USA
[4] Univ Texas Southwestern Med Ctr Dallas, Dept Clin Sci, Dallas, TX 75390 USA
[5] Beaumont Hlth Syst, Dept Cardiovasc Med, Royal Oak, MI USA