[1] Univ Penn, Perelman Sch Med, Dept Med, Philadelphia, PA 19104 USA
[2] Univ Penn, Perelman Sch Med, GME Evaluat & Assessment, Philadelphia, PA 19104 USA
[3] Univ Colorado, Dept Med, Aurora, CO USA
[4] Univ Calif San Francisco, Sch Med, Dept Med, San Francisco, CA USA
[5] Univ Illinois, Coll Med, Dept Med, Peoria, IL 61656 USA
[6] Johns Hopkins Univ, Sch Med, Dept Med, Baltimore, MD 21205 USA
[7] Univ Chicago, Pritzker Sch Med, Dept Med, Chicago, IL 60637 USA
[8] Thomas Jefferson Univ, Jefferson Med Coll, Dept Med, Philadelphia, PA 19107 USA
[9] Uniformed Serv Univ Hlth Sci, Dept Med, Bethesda, MD 20814 USA
[10] Univ Pittsburgh, Sch Med, Dept Med, Pittsburgh, PA 15213 USA
[11] Harvard Univ, Sch Med, Dept Med, Boston, MA USA
[12] Univ Illinois, Coll Med, Dept Med, Chicago, IL USA
[13] Univ Rochester, Sch Med & Dent, Dept Med, Rochester, NY 14642 USA
[14] George Washington Univ, Sch Med & Hlth Sci, Dept Med, Washington, DC 20052 USA
[15] Univ Minnesota, Sch Med, Dept Med, Minneapolis, MN 55455 USA
[16] Univ Washington, Sch Med, Dept Med, Seattle, WA 98195 USA
[17] Drexel Univ, Dept Med, Coll Med, Philadelphia, PA 19104 USA