[1] Brown Univ, Warren Alpert Med Sch, Providence, RI 02912 USA
[2] Tufts Univ, Sch Med, Boston, MA 02111 USA
[3] Inova Fairfax Med Campus, Fairfax, VA USA
[4] Baylor Scott & White Hlth, Dallas, TX USA
[5] Allegheny Gen Hosp, Pittsburgh, PA 15212 USA
[6] Beth Israel Deaconess Med Ctr, Boston, MA 02215 USA
[7] Univ Pittsburgh, Med Ctr, Pittsburgh, PA USA
[8] Providence St Vincent Med Ctr, Portland, OR USA
[9] Medical City Dallas, Dallas, TX USA
[10] Allegheny Gen Hosp, Pittsburgh, PA 15212 USA
[11] Univ Oklahoma, Hlth Sci Ctr, Oklahoma City, OK USA
[12] Massachusetts Gen Hosp, Boston, MA 02114 USA
[13] Univ Chicago, Pritzker Sch Med, Chicago, IL 60637 USA
[14] Northwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USA
[15] UTMB John Sealy Sch Med, Galveston, TX USA
[16] Maine Med Ctr, Portland, ME 04102 USA
[17] Houston Methodist Hosp, Houston, TX 77030 USA
[18] Thomas Jefferson Univ, Sidney Kimmel Med Coll, Philadelphia, PA 19107 USA
[19] Columbia Univ, Med Ctr, New York, NY USA