[1] So Illinois Univ, Div Gen Med, Dept Med, Hypertens Sect, Springfield, IL 62794 USA
[2] Harvard Univ, Brigham & Womens Hosp, Heart & Vasc Ctr, Sch Med, Boston, MA 02115 USA
[3] Piedmont Heart Inst, Div Cardiol, Dept Med, Atlanta, GA USA
[4] Heart Hosp Baylor Plano, Cardiovasc Div, Dept Med, Plano, TX USA
[5] Medtron CardioVasc, Clin Dept, Santa Rosa, CA USA
[6] Heart & Vasc Hosp, Baylor Soltero Cardiovasc Res Ctr, Dallas, TX USA
[7] Boston Univ, Sch Publ Hlth, Dept Biostat, Boston, MA 02215 USA
[8] Columbia Univ, Dept Med, Div Cardiol, New York Presbyterian Hosp,Med Ctr, New York, NY USA
[9] Cardiovasc Res Fdn, New York, NY USA
[10] Harvard Clin Res Inst, Div Cardiol, Dept Med, Boston, MA USA
[11] Henry Ford Detroit Hosp, Div Cardiol, Dept Med, Detroit, MI USA
[12] Univ Alabama Birmingham, Dept Med, Div Cardiovasc Dis, Birmingham, AL 35294 USA
[13] St Johns Hosp, Prairie Heart Inst, Springfield, IL USA
[14] Univ Penn, Dept Med, Div Renal, Perelman Sch Med, Philadelphia, PA 19104 USA
[15] Univ Chicago Med, Hypertens Dis Ctr, Chicago, IL USA