[1] North Shore Univ Hlth Syst, Skokie, IL USA
[2] Penn State Univ, Milton S Hershey Med Ctr, Hershey, PA 17033 USA
[3] Texas A&M Univ, Coll Med, Div Cardiol, Texas A&M Hlth Sci Ctr,Cardiol Div Scott & White, Temple, TX 76508 USA
[4] Lehigh Valley Hosp, Allentown, PA USA
[5] Duke Clin Res Inst, Div Cardiol, Durham, NC USA
[6] E Carolina Univ, Brody Sch Med, Greenville, NC USA
[7] Harvard Univ, Sch Med, Dept Med, Boston, MA USA
[8] Washington Adventist Hosp, Takoma Pk, MD USA
[9] Harvard Univ, St Vincent Hosp, Worcester, MA USA