[1] Univ Iowa, Roy A & Lucille J Carver Coll Med, Iowa City, IA USA
[2] Univ Iowa, Coll Publ Hlth, Dept Epidemiol, Iowa City, IA USA
[3] Univ Iowa, Coll Publ Hlth, Dept Emergency Med, Iowa City, IA 52242 USA
[4] Univ Iowa, Dept Anesthesia, Div Crit Care, Iowa City, IA 52242 USA
[5] Univ Iowa, Tippie Coll Business, Iowa City, IA 52242 USA