[1] Univ Michigan Hlth Syst, Ann Arbor, MI USA
[2] Thoratec Corp, Pleasanton, CA USA
[3] Duke Univ, Med Ctr, Durham, NC USA
[4] Mayo Clin, Rochester, MN USA
[5] Advocate Christ Med Ctr, Oak Lawn, IL USA
[6] Sharp Mem Hosp & Rehabil Ctr, San Diego, CA USA
[7] Univ Louisville, Louisville, KY 40292 USA