[1] Tufts Med Ctr, Boston, MA USA
[2] Brigham & Womens Hosp, Boston, MA 02115 USA
[3] Thoratec Corp, Pleasanton, CA USA
[4] Providence Hlth, Portland, OR USA
[5] Tenet Florida, Delray, FL USA
[6] St Vincent Heart Ctr, Indianapolis, IN USA
[7] Univ Minnesota, Minneapolis, MN USA
[8] Washington Univ, St Louis, MO USA
[9] Univ N Carolina, Chapel Hill, NC USA
[10] Ohio State Univ, Columbus, OH 43210 USA
[11] Spectrum Hlth, Grand Rapids, MI USA
[12] Baylor Univ, Med Ctr, Dallas, TX USA
[13] Duke Univ, Med Ctr, Durham, NC USA
[14] Northwestern Univ, Chicago, IL 60611 USA
[15] Univ Chicago, Chicago, IL 60637 USA