[1] Mt Sinai Sch Med, Dept Emergency Med, New York, NY 10029 USA
[2] Duke Univ, Sch Nursing, Durham, NC USA
[3] Duke Univ, Sch Med, Durham, NC USA
[4] Mt Sinai Sch Med, Grad Sch, New York, NY USA
[5] Johns Hopkins Sch Med, Welch Ctr Prevent Epidemiol & Clin Res, Baltimore, MD USA
[6] Johns Hopkins Berman Inst Bioeth, Baltimore, MD USA
[7] Vanderbilt Childrens Hosp, Nashville, TN USA