[1] Univ Minnesota, Minneapolis, MN USA
[2] Vanderbilt Univ, 221 Kirkland Hall, Nashville, TN 37235 USA
[3] Mayo Clin, Rochester, MN USA
[4] Ohio State Univ, Med Ctr, Columbus, OH 43210 USA
[5] Univ Florida, Gainesville, FL USA
[6] Mem Hermann Texas Med Ctr, Houston, TX USA
[7] Univ Colorado, Sch Med, Denver, CO USA
[8] Univ Chicago, Med Ctr, Chicago, IL 60637 USA
[9] Sutter Med Ctr, Sacramento, CA USA
[10] Minneapolis Heart Inst, Minneapolis, MN USA
[11] UCLA Med Ctr, Santa Monica, CA USA
[12] Allegheny Gen Hosp, Pittsburgh, PA USA
[13] Sharp Mem Hosp & Rehabil Ctr, San Diego, CA USA
[14] St Jude Med, Pleasanton, CA USA
[15] Univ N Carolina, Chapel Hill, NC USA