[1] Univ Puerto Rico Sch Med, Hosp UPR Dr Federico Trilla, Dept Emergency Med, Carolina, PR 00985 USA
[2] WakeMed Hlth & Hosp, Emergency Serv Inst, Raleigh, NC 27610 USA
[3] Univ N Carolina, Chapel Hill, NC 27599 USA
[4] Uniformed Serv Univ Hlth Sci, Bethesda, MD 20814 USA