title: All Boxes Are Black.
authors.affiliation: From the *Department of Anesthesiology and Perioperative Medicine, David Geffen School of Medicine, UCLA, Los Angeles, California; and †Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University, Stanford, California.
authors.forename: Maxime
authors.initials: M
authors.lastname: Cannesson
authors.forename: Steven L
authors.initials: SL
authors.lastname: Shafer
mesh_terms: D006452:Hemoglobinometry / Q000379:methods*; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D016343:Monitoring, Intraoperative / Q000379:methods*
chemical_list: D006454:Hemoglobins