title: In response.
authors.affiliation: Department of Anesthesiology, Duke University, Durham, North Carolina, tong.gan@duke.edu.
authors.forename: Nathan H
authors.initials: NH
authors.lastname: Waldron
authors.forename: Timothy E
authors.initials: TE
authors.lastname: Miller
authors.forename: Tong J
authors.initials: TJ
authors.lastname: Gan
mesh_terms: D002302:Cardiac Output / Q000502:physiology*; D003106:Colon / Q000601:surgery*; D013505:Digestive System Surgical Procedures / Q000379:methods*; D004947:Esophagus / Q000000981:diagnostic imaging*; D005260:Female; D005440:Fluid Therapy / Q000379:methods*; D006801:Humans; D008297:Male; D016343:Monitoring, Intraoperative / Q000295:instrumentation* / Q000379:methods*; D012007:Rectum / Q000601:surgery*; D014463:Ultrasonography