[1] Univ Virginia Hlth Syst, Dept Anesthesiol, Charlottesville, VA 22903 USA
[2] Univ Calif San Francisco, Dept Anesthesia & Perioperat Care, San Francisco, CA USA
[3] Mt Sinai Hosp, Dept Anesthesiol Perioperat & Pain Med, Icahn Sch Med Mt Sinai, New York, NY 10029 USA
[4] Childrens Natl Med Ctr, Dept Anesthesiol Pain & Perioperat Med, Washington, DC 20010 USA
[5] Univ Cape Town, Red Cross War Mem Childrens Hosp, Dept Anaesthesia & Perioperat Med, Cape Town, South Africa
[6] Kaiser Permanente, Dept Plast & Reconstruct Surg, Los Angeles, CA USA
[7] Univ Southern Calif, Div Plast & Reconstruct Surg, Los Angeles, CA USA