[1] Methodist Hosp, Methodist DeBakey Heart & Vasc Cntr, Houston, TX 77030 USA
[2] Univ Auckland, Dept Med, Auckland, New Zealand
[3] Univ Auckland, Natl Inst Hlth Innovat, Auckland 1, New Zealand
[4] Hackensack Univ Med Cntr, Dept Med, Hackensack, NJ USA
[5] Norwegian Univ Sci & Technol, MI Lab, N-7034 Trondheim, Norway
[6] Norwegian Univ Sci & Technol, Dept Circulat & Med Imaging, N-7034 Trondheim, Norway
[7] Unitec Inst Technol, Fac Social & Hlth Sci, Auckland, New Zealand