[1] Univ Texas Southwestern Med Ctr, Dept Internal Med, Hypertens Sect, Dallas, TX 75390 USA
[2] Univ Texas Southwestern Med Ctr, Sch Hlth Profess, Dept Appl Clin Res, Dallas, TX USA
[3] Univ Texas Southwestern Med Ctr, Dept Internal Med, Cardiol Div, Dallas, TX 75390 USA