[1] Oregon Hlth & Sci Univ, Portland, OR 97201 USA
[2] Rsch Triangle Int, Stat, Rockville, MD USA
[3] Johns Hopkins Univ, Baltimore, MD USA
[4] Baylor Coll Med, Houston, TX USA
[5] Univ Texas Huston, Houston, TX USA
[6] Cornell Univ, New York, NY 10021 USA
[7] Univ Penn, Philadelphia, PA 19104 USA
[8] Univ Hawaii, Queens Med Cntr, Honolulu, HI 96822 USA
[9] Harbor Hosp, NIA, Baltimore, MD USA
[10] RTI Int, Med, Rockville, MD USA
[11] Univ Michigan, Ann Arbor, MI 48109 USA
[12] NHLBI, NIH, Bethesda, MD 20892 USA