Kelz, Max B Does it add up? [electronic resource] - Anesthesia and analgesia Aug 2008 - 365-6 p. digital Publication Type: Comment; Editorial ISSN: 1526-7598 Standard No.: 10.1213/ane.0b013e31817e0e5b doi Subjects--Topical Terms: Anesthetics--pharmacologyDrug SynergismHumans