[1] Wake Forest Univ, Sch Med, Ultrasound Reading Ctr, Winston Salem, NC 27157 USA
[2] Univ Minnesota, Minneapolis, MN USA
[3] Univ N Carolina, Chapel Hill, NC USA
[4] NHLBI, Bethesda, MD 20892 USA
[5] Univ Mississippi, Med Ctr, Jackson, MS 39216 USA
[6] Johns Hopkins Univ, Baltimore, MD USA
[7] Univ Texas, Sch Med, Houston, TX USA
[8] Methodist Hosp, Atherosclerosis Clin Lab, Houston, TX 77030 USA