Ward Christopher M, Hogan Kirk J, Eckenhoff Roderic G
Department of Anesthesiology and Critical Care, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
Department of Anesthesiology, University of Wisconsin School of Medicine and Public Health, Madison.
JAMA. 2015 Jul 28;314(4):408-9. doi: 10.1001/jama.2015.7378.