[1] Assoc Amer Med Coll, Washington, DC 20037 USA
[2] Univ Calif San Francisco, Sch Med, Div Pediat Immunol Rheumatol, San Francisco, CA 94143 USA
[3] Univ Kansas, Sch Med, Kansas City, KS USA
[4] Yale Univ, Sch Med, New Haven, CT 06520 USA
[5] Med Coll Wisconsin, Milwaukee, WI 53226 USA
[6] Univ Virginia, Sch Med, Charlottesville, VA 22908 USA
[7] Univ Michigan, Med Ctr, Dept Obstet & Gynecol, Ann Arbor, MI 48109 USA
[8] Drexel Univ, Coll Med, Natl Ctr Leadership Acad Med, Philadelphia, PA 19104 USA
[9] Univ Penn, Sch Med, Philadelphia, PA 19104 USA
[10] Univ N Carolina, Dept Surg, Chapel Hill, NC USA
[11] Johns Hopkins Univ, Baltimore, MD USA