[1] Duke Univ, Dept Family Med & Community Hlth, Sch Med, 2100 Erwin Rd, Durham, NC 27705 USA
[2] Duke Univ, Dept Family Med & Community Hlth, Sch Med, Durham, NC USA
[3] Duke Univ, Dept Pediat, Sch Med, Durham, NC USA
[4] Childrens Hosp Philadelphia, Div Emergency Med, Philadelphia, PA USA
[5] Maastricht Univ, Sch Hlth Profess Educ, Workplace Learning, Maastricht, Netherlands