[1] Univ Calif Irvine, Irvine, CA 92717 USA
[2] New York Med Coll, Valhalla, NY 10595 USA
[3] Univ N Carolina, Chapel Hill, NC 27599 USA
[4] Univ Chicago, Chicago, IL 60637 USA
[5] Univ Washington, Seattle, WA 98195 USA
[6] Johns Hopkins Univ, Sch Med, Baltimore, MD 21218 USA
[7] Albert Einstein Coll Med, Bronx, NY 10467 USA
[8] Univ Texas, Hlth Sci Ctr, San Antonio, TX 78284 USA
[9] Univ Penn, Sch Med, Philadelphia, PA 19104 USA
[10] Univ Pittsburgh, Sch Med, Pittsburgh, PA USA
[11] Brown Univ, Providence, RI 02912 USA
[12] Univ Colorado, Hlth Sci Ctr, Denver, CO 80262 USA
[13] Vanderbilt Univ, Med Ctr, Nashville, TN USA
[14] Univ Miami, Sch Med, Coral Gables, FL 33124 USA
[15] Yale Univ, New Haven, CT 06520 USA