[1] Minneapolis Vet Affairs Healthcare Syst, Dept Med, Div Cardiol, Minneapolis, MN USA
[2] Univ Minnesota, Sch Med, Dept Med, Minneapolis, MN 55455 USA
[3] Hennepin Cty Med Ctr, Dept Med, Minneapolis, MN 55415 USA
[4] Pk Nicollet Clin Heart & Vasc Ctr, Div Cardiol, Dept Med, St Louis Pk, MN USA
[5] VA North Texas Healthcare Syst, Div Cardiol, Dept Med, Dallas, TX USA
[6] Univ Texas Southwestern Med Sch, Dallas, TX USA