Reproduced from: Malagelada J-R, Malagelada C. Nausea and vomiting. In: Sleisenger and Fordtran's Gastrointestinal Disease, 10th ed, Feldman M, Freidman LS, Brandt LJ (Eds). WB Saunders, Philadelphia 2015. Illustration used with the permission of Elsevier Inc. All rights reserved.
