[1] Univ Penn, Robert Wood Johnson Fdn, Clin Scholars Program, Philadelphia, PA 19104 USA
[2] Univ Penn, Dept Emergency Med, Philadelphia, PA 19104 USA
[3] Louisiana State Univ, Hlth Sci Ctr, Robert Wood Johnson Fdn, Hlth Policy Fellows Program, New Orleans, LA USA
[4] Dept Hlth & Human Serv, Off Assistant Secretary Preparedness & Response, Washington, DC USA