[1] Univ Penn, Sch Nursing, Dept Family & Community Hlth, Philadelphia, PA 19104 USA
[2] Emory Univ, Sch Med, Dept Surg, Atlanta, GA 30322 USA
[3] Temple Univ, Lewis Katz Sch Med, Dept Surg, Div Trauma & Surg Crit Care, Philadelphia, PA 19122 USA
[4] Univ Penn, Dept Family & Community Hlth, Sch Nursing, Claire Fagin Hall M,418 Curie Blvd, Philadelphia, PA 19104 USA