[1] Aarhus Univ Hosp, Res Ctr Emergency Med, Aarhus, Denmark
[2] Randers Reg Hosp, Emergency Dept, Randers, Denmark
[3] Univ Penn, Childrens Hosp Philadelphia, Dept Anesthesiol & Crit Care Med, Ctr Pediat Resuscitat,Perelman Sch Med, Philadelphia, PA 19104 USA
[4] Cincinnati Childrens Hosp Med Ctr, Div Crit Care Med, Cincinnati, OH 45229 USA
[5] Bambino Gesu Childrens Hosp IRCCS, Profess Dev Continuing Educ & Res Unit, Rome, Italy
[6] Columbia Univ, Dept Pediat, New York, NY 10027 USA