[1] Univ Calif San Francisco, Cardiovasc Res Inst, San Francisco, CA 94143 USA
[2] Johns Hopkins Univ, Baltimore, MD USA
[3] Univ N Carolina, Chapel Hill, NC USA
[4] Genentech Inc, San Francisco, CA USA
[5] Mayo Clin, Rochester, MN USA
[6] San Francisco Gen Hosp, San Francisco, CA 94110 USA
[7] Duke Univ, Durham, NC USA
[8] Univ Colorado, Denver, CO 80202 USA
[9] Massachusetts Gen Hosp, Boston, MA 02114 USA
[10] Baystate Med Ctr, Springfield, MA USA
[11] Univ Washington, Harborview, WA USA
[12] Baylor Coll Med, Houston, TX 77030 USA
[13] Johns Hopkins Univ Hosp, Baltimore, MD 21287 USA
[14] Univ Maryland, College Pk, MD 20742 USA
[15] Washington Hosp Ctr, Washington, DC USA
[16] Cleveland Clin Fdn, Cleveland, OH USA
[17] Univ Hosp Cleveland, Cleveland, OH 44106 USA
[18] Denver Hlth Med Ctr, Denver, CO USA
[19] Vanderbilt Univ, Nashville, TN USA
[20] Wake Forest Univ, Winston Salem, NC 27109 USA
[21] Univ Virginia, Charlottesville, VA 22903 USA
[22] Univ Calif San Francisco, Fresno, CA USA
[23] Univ Calif Davis, Davis, CA USA
[24] Louisiana State Univ, Baton Rouge, LA 70803 USA
[25] Baton Rouge Gen Med Ctr Mid City, Baton Rouge, LA USA
[26] Baton Rouge Gen Med Ctr Bluebonnet, Baton Rouge, LA USA
[27] Tulane Univ, New Orleans, LA 70118 USA
[28] Massachusetts Gen Hosp, Clin Coordinating Ctr, Boston, MA 02114 USA
[29] Harvard Univ, Sch Med, Cambridge, MA 02138 USA