[1] TH Chan Sch Publ Hlth, Ctr Surg & Publ Hlth, Boston, MA USA
[2] Johns Hopkins Univ, Sch Med, Dept Surg, Div Acute Care Surg, Baltimore, MD 21205 USA
[3] Johns Hopkins Univ, Sch Med, Div Hlth Sci Informat, Baltimore, MD USA
[4] Johns Hopkins Med, Armstrong Inst Patient Safety & Qual, Baltimore, MD USA
[5] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Hlth Policy & Management, Baltimore, MD USA
[6] Brigham & Womens Hosp, Dept Surg, 75 Francis St, Boston, MA 02115 USA