[1] Texas Childrens Hosp, Dept Anesthesiol Perioperat & Pain Med, Houston, TX 77030 USA
[2] Texas Childrens Hosp, Sect Pediat Crit Care Med, Dept Pediat, Houston, TX 77030 USA
[3] Baylor Coll Med, Houston, TX 77030 USA
[4] Baystate Med Ctr, Dept Anesthesiol & Pain Med, Springfield, MA USA
[5] Univ Massachusetts, Sch Med, Worcester, MA 01605 USA