[1] Emory Univ, Sch Med, Atlanta, GA 30322 USA
[2] Med Coll Virginia, Richmond, VA USA
[3] Case Western Reserve Univ, Cleveland, OH 44106 USA
[4] Baylor Univ, Waco, TX 76798 USA
[5] Stanford Univ, Stanford, CA 94305 USA
[6] Univ Calif San Francisco, San Francisco, CA 94143 USA
[7] Univ Miami, Coral Gables, FL 33124 USA
[8] Univ Chicago, Chicago, IL 60637 USA