Netter's gastroenterology / Martin H. Floch, C. S. Pitchumoni, Neil R. Floch, Raul J. Rosenthal, James S. Scolapio, Joseph K. Lim ; illustrations by Frank H. Netter ; contributing illustrators, Carlos A. G. Machado, John A. Craig, Kip Carter, David Mascaro, Steven Moon, Kristen Wienandt Marzejon, Mike de la Flor.